Faculty Profiles - KAWASAKI Shinji

写真a

KAWASAKI Shinji

Organization

Faculty of Environmental, Life, Natural Science and Technology Associate Professor

Contact information

Homepage

https://www.physics.okayama-u.ac.jp/zheng_homepage/

External link

Degree

D.Sc. ( 2004.3 Osaka University )
M.E. ( 2001.3 Osaka University )

Research Interests

superconductivity
charge density wave
magnetism
uniaxial stress
strongly correlated electron systems
high magnetic field
Nuclear magnetic resonance / nuclear quadrupole resonance
high Tc cuprate
heavy fermion systems
high pressure
strain

Research Areas

Natural Science / Magnetism, superconductivity and strongly correlated systems

Education

Osaka University 大学院基礎工学研究科博士後期課程物理系専攻

2001.4 - 2004.3

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Country： Japan

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Osaka University 大学院基礎工学研究科博士前期課程物理系専攻

1999.4 - 2001.3

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Country： Japan

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Osaka University 基礎工学部物性物理工学科

1995.4 - 1999.3

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Country： Japan

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大阪府立高津高等学校

1992.4 - 1995.3

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Country： Japan

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Research History

Okayama University Faculty of Science Department of Physics Associate Professor

2013.1

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Country：Japan

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Okayama University Faculty of Science Department of Physics senior assistant professor

2006.4 - 2012.12

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Country：Japan

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Osaka University Graduate School of Engineering Science

2005.4 - 2006.3

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Country：Japan

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Osaka University Graduate School of Engineering Science

2004.4 - 2005.3

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Country：Japan

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Osaka University Graduate School of Engineering Science

2003.4 - 2004.3

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Country：Japan

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Professional Memberships

高温超伝導フォーラム

2013

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日本物理学会

1999

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Committee Memberships

日本物理学会会誌編集委員（第８０期～第８１期）

2024.4 - 2026.3

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Committee type：Academic society

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強相関電子系国際会議SCES2019 現地実行委員

2019.9

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Committee type：Academic society

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高温超伝導フォーラム幹事

2017.10 - 2019.9

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Committee type：Academic society

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日本物理学会領域８運営委員代表

2015.4 - 2015.9

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Committee type：Academic society

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日本物理学会第71-72期代議員

2015.3 - 2017.3

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Committee type：Academic society

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日本物理学会領域８運営委員

2014.10 - 2015.3

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Committee type：Academic society

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日本物理学会第65回年次大会実行委員

2010

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Committee type：Academic society

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Papers

Structural Analysis under Uniaxial Strain Using Synchrotron Radiation Reviewed

Akito Kobayashi, Seiya Nita, Nao Tsukuda, Asuka Mine, Hayate Nishigaki, Musashi Yokoyama, Shogo Yoshida, Kazuaki Matano, Shinji Kawasaki, Kenji Ishii, Guo-qing Zheng

12 ( 5 ) 325 - 328 2024.10

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Authorship：Corresponding author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)

DOI： 10.18957/rr.12.5.325

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Strain-induced long-range charge-density wave order in the optimally doped Bi2Sr2−xLaxCuO6 superconductor Reviewed

Shinji Kawasaki, Nao Tsukuda, Chengtian Lin, Guo-qing Zheng

Nature Communications 15 5082 2024.6

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

The mechanism of high-temperature superconductivity in copper oxides (cuprate) remains elusive, with the pseudogap phase considered a potential factor. Recent attention has focused on a long-range symmetry-broken charge-density wave (CDW) order in the underdoped regime, induced by strong magnetic fields. Here by ^63,65Cu-nuclear magnetic resonance, we report the discovery of a long-range CDW order in the optimally doped Bi₂Sr_2−xLa_xCuO₆ superconductor, induced by in-plane strain exceeding ∣ε∣ = 0.15 %, which deliberately breaks the crystal symmetry of the CuO₂ plane. We find that compressive/tensile strains reduce superconductivity but enhance CDW, leaving superconductivity to coexist with CDW. The findings show that a long-range CDW order is an underlying hidden order in the pseudogap state, not limited to the underdoped regime, becoming apparent under strain. Our result sheds light on the intertwining of various orders in the cuprates.

DOI： 10.1038/s41467-024-49225-w

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Other Link： https://www.nature.com/articles/s41467-024-49225-w
Charge Order and Fluctuations in Bi2Sr2−xLaxCuO6+δ Revealed by 63,65Cu-Nuclear Magnetic Resonance Invited Reviewed

Shinji Kawasaki, Madoka Ito, Dai Kamijima, Chengtian Lin, Guo-qing Zheng

Journal of the Physical Society of Japan 90 ( 11 ) 111008 - 111008 2021.11

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan

DOI： 10.7566/jpsj.90.111008

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Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5 Reviewed

Shinji Kawasaki, Toshihide Oka, Akira Sorime, Yuji Kogame, Kazuhiro Uemoto, Kazuaki Matano, Jing Guo, Shu Cai, Liling Sun, John L. Sarrao, Joe D. Thompson, Guo-qing Zheng

Communications Physics 3 ( 1 ) 2020.8

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media {LLC}

<jats:title>Abstract</jats:title><jats:p>A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure (<jats:italic>P</jats:italic>)-dependent <jats:sup>115</jats:sup>In nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh<jats:sub>0.5</jats:sub>Ir<jats:sub>0.5</jats:sub>In<jats:sub>5</jats:sub>. These experiments reveal an antiferromagnetic (AF) QCP at <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{AF } } }=1.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mrow>
<mml:mi>P</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>c</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>AF</mml:mi>
</mml:mrow>
</mml:msubsup>
<mml:mo>=</mml:mo>
<mml:mn>1.2</mml:mn>
</mml:math></jats:alternatives></jats:inline-formula> GPa where a dome of superconductivity reaches a maximum transition temperature <jats:italic>T</jats:italic><jats:sub>c</jats:sub>. Preceding <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{AF } } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mrow>
<mml:mi>P</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>c</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>AF</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula>, however, the NQR frequency <jats:italic>ν</jats:italic><jats:sub>Q</jats:sub> undergoes an abrupt increase at <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{* } } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mrow>
<mml:mi>P</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>c</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>*</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula> = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium’s <jats:italic>f</jats:italic>-electron and associated small-to-large change in the Fermi surface. At <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{AF } } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:msubsup>
<mml:mrow>
<mml:mi>P</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>c</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>AF</mml:mi>
</mml:mrow>
</mml:msubsup>
</mml:math></jats:alternatives></jats:inline-formula> where <jats:italic>T</jats:italic><jats:sub>c</jats:sub> is optimized, there is an unusually large fraction of gapless excitations well below <jats:italic>T</jats:italic><jats:sub>c</jats:sub> that implicates spin-singlet, odd-frequency pairing symmetry.</jats:p>

DOI： 10.1038/s42005-020-00418-x

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Charge-density-wave order takes over antiferromagnetism in Bi2Sr2−x La x CuO6 superconductors Reviewed

S. Kawasaki, Z. Li, M. Kitahashi, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

Nature Communications 8 ( 1 ) 2017.11

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media {LLC}

<jats:title>Abstract</jats:title><jats:p>Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known. Recently, charge density wave (CDW) was found below the superconducting dome in YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>
<jats:italic>y</jats:italic>
</jats:sub> when a high magnetic field is applied perpendicular to the CuO<jats:sub>2</jats:sub> plane, which was suggested to arise from incipient CDW in the vortex cores that becomes overlapped. Here by <jats:sup>63</jats:sup>Cu-nuclear magnetic resonance, we report the discovery of CDW induced by an in-plane field, setting in above the dome in single-layered Bi<jats:sub>2</jats:sub>Sr<jats:sub>2−<jats:italic>x</jats:italic>
</jats:sub>La<jats:sub>
<jats:italic>x</jats:italic>
</jats:sub>CuO<jats:sub>6</jats:sub>. The onset temperature <jats:italic>T</jats:italic><jats:sub>CDW</jats:sub> takes over the antiferromagnetic order temperature <jats:italic>T</jats:italic><jats:sub>N</jats:sub> beyond a critical doping level at which superconductivity starts to emerge, and scales with the pseudogap temperature <jats:italic>T</jats:italic>*. These results provide important insights into the relationship between spin order, CDW and the pseudogap, and their connections to high-temperature superconductivity.</jats:p>

DOI： 10.1038/s41467-017-01465-9

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Carrier-Concentration Dependence of the Pseudogap Ground State of Superconducting Bi2Sr2−xLaxCuO6+δ Revealed by 63,65Cu-Nuclear Magnetic Resonance in Very High Magnetic Fields Reviewed

Shinji Kawasaki, Chengtian Lin, Philip L. Kuhns, Arneil P. Reyes, Guo-qing Zheng

Physical Review Letters 105 ( 13 ) 2010.9

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DOI： 10.1103/physrevlett.105.137002

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123Sb-NQR study of unconventional superconductivity in the filled skutterudite heavy-fermion compound PrOs4Sb12 under high pressure up to 3.82 GPa Reviewed

S. Kawasaki, K. Katayama, H. Sugawara, D. Kikuchi, H. Sato, Guo-qing Zheng

Physical Review B 78 ( 6 ) 2008.8

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.78.064510

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Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An 115In-NQR study under pressure Reviewed

S. Kawasaki, M. Yashima, Y. Kitaoka, K. Takeda, K. Shimizu, Y. Oishi, M. Takata, T. C. Kobayashi, H. Harima, S. Araki, H. Shishido, R. Settai, Y. Ōnuki

Physical Review B 77 ( 6 ) 2008.2

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.77.064508

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Gapless Magnetic and Quasiparticle Excitations due to the Coexistence of Antiferromagnetism and Superconductivity in CeRhIn5: A Study of 115In NQR under Pressure Reviewed

S. Kawasaki, T. Mito, Y. Kawasaki, G.-q. Zheng, Y. Kitaoka, D. Aoki, Y. Haga, Y. Ōnuki

Physical Review Letters 91 ( 13 ) 2003.9

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DOI： 10.1103/physrevlett.91.137001

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Single Crystal Growth of and Hyperfine Couplings in the Spin-Triplet Superconductor K₂Cr₃As₃ Reviewed

Seigo Ogawa, Tomoki Miyoshi, Kazuaki Matano, Shinji Kawasaki, Yoshihiko Inada, Guo-qing Zheng

Journal of the Physical Society of Japan 92 ( 6 ) 2023.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan

DOI： 10.7566/jpsj.92.064711

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Antiferromagnetic spin fluctuations and superconductivity in NbRh2B2 and TaRh2B2 with a chiral crystal structure Reviewed

Kazuaki Matano, Ryo Ogura, Matéo FONTAINE, Harald O. Jeschke, Shinji Kawasaki, Guo-qing Zheng

Physical Review B 104 ( 22 ) 2021.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.104.224508

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Transport signatures of the pseudogap critical point in the cuprate superconductor Bi2Sr2−xLaxCuO6+δ Reviewed

M. Lizaire, Anaëlle Legros, A. Gourgout, S. Benhabib, S. Badoux, F. Laliberté, Marie-Eve Boulanger, A. Ataei, Gaël Grissonnanche, D. LeBoeuf, S. Licciardello, S. Wiedmann, S. Ono, H. Raffy, S. Kawasaki, G.-Q. Zheng, N. Doiron-Leyraud, Cyril Proust, Louis Taillefer

Physical Review B 104 ( 1 ) 2021.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.104.014515

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Doping-enhanced antiferromagnetism in Ca1−xLaxFeAs2 Reviewed

Shinji Kawasaki, Tomosuke Mabuchi, Satoki Maeda, Tomoki Adachi, Tasuku Mizukami, Kazutaka Kudo, Minoru Nohara, Guo-qing Zheng

Physical Review B 92 ( 18 ) 2015.11

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DOI： 10.1103/physrevb.92.180508

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Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by 75As−NMR/NQR and 195Pt−NMR Reviewed

Shinji Kawasaki, Yoshihiko Tani, Tomosuke Mabuchi, Kazutaka Kudo, Yoshihiro Nishikubo, Daisuke Mitsuoka, Minoru Nohara, Guo-qing Zheng

Physical Review B 91 ( 6 ) 2015.2

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.91.060510

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Magnetism and superconductivity in Sr2VFeAsO3 revealed by 75As- and 51V-NMR under elevated pressures Reviewed

Keiji Ueshima, Fei Han, Xiyu Zhu, Hai-Hu Wen, Shinji Kawasaki, Guo-qing Zheng

Physical Review B 89 ( 18 ) 2014.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.89.184506

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The Mott State and Superconductivity in Face-Centred Cubic Structured Cs₃C₆₀: A¹³³Cs-Nuclear Magnetic Resonance Study under Pressure Reviewed

Shinji Kawasaki, Junji Fukui, Takeshi Motoyama, Yuta Suzuki, Seiji Shibasaki, Guo-qing Zheng

Journal of the Physical Society of Japan 82 ( 1 ) 014709 - 014709 2013.1

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan

DOI： 10.7566/jpsj.82.014709

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Cu-NMR Study of Bi2Sr1.6La0.4CuO6+δ Superconductor in Very High Magnetic Fields Reviewed

S Kawasaki, C T Lin, P L Kuhns, A P Reyes, Guo-qing Zheng

Journal of Physics: Conference Series 400 ( 2 ) 022052 - 022052 2012.12

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Authorship：Lead author,　Corresponding author Publishing type：Research paper (scientific journal) Publisher：{IOP} Publishing

DOI： 10.1088/1742-6596/400/2/022052

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Pseudogap Ground State and Its Doping Evolution in Bi2Sr2−x La x CuO6+δ : Removing the Superconducting State by the Application of Very High Magnetic Fields Reviewed

Guo-qing Zheng, S. Kawasaki, C. T. Lin, P. L. Kuhns, A. P. Reyes

Journal of Superconductivity and Novel Magnetism 25 ( 5 ) 1249 - 1253 2012.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media {LLC}

DOI： 10.1007/s10948-012-1575-4

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Luttinger-volume violating Fermi liquid in the pseudogap phase of the cuprate superconductors Reviewed

Jia-Wei Mei, Shinji Kawasaki, Guo-Qing Zheng, Zheng-Yu Weng, Xiao-Gang Wen

Physical Review B 85 ( 13 ) 2012.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.85.134519

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Antiferromagnetic Spin Fluctuations above the Dome-Shaped and Full-Gap Superconducting States of LaFeAsO1−xFx Revealed by 75As-Nuclear Quadrupole Resonance Reviewed

T. Oka, Z. Li, S. Kawasaki, G. F. Chen, N. L. Wang, Guo-qing Zheng

Physical Review Letters 108 ( 4 ) 2012.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevlett.108.047001

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As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2 Reviewed

S. Kawasaki, T. Oka, T. Tabuchi, X.F. Wang, X.H. Chen, Guo-qing Zheng

Journal of Physics and Chemistry of Solids 72 ( 5 ) 501 - 504 2011.5

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DOI： 10.1016/j.jpcs.2010.10.010

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Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog Reviewed

Z. Li, S. Kawasaki, T. Oka, T. Tabuchi, Y. Ooe, M. Ichioka, Z.A. Ren, Z.X. Zhao, J.L. Luo, N.L. Wang, X.C. Wang, Q.Q. Liu, C.Q. Jin, C.T. Lin, Guo-qing Zheng

Journal of Physics and Chemistry of Solids 72 ( 5 ) 492 - 496 2011.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.jpcs.2010.10.038

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As-NQR study of superconductivity in LaRAsO1−F (R=Fe and Ni) Reviewed

T. Oka, T. Tabuchi, Z. Li, S. Kawasaki, G.F. Chen, J.L. Luo, N.L. Wang, Guo-qing Zheng

Journal of Physics and Chemistry of Solids 72 ( 5 ) 497 - 500 2011.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.jpcs.2010.10.022

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As-NMR/NQR Study of CaFe₂As₂under Pressure Reviewed

Shinji Kawasaki, Toshihide Oka, Takahisa Tabuchi, X. F. Wang, X. H. Chen, Guo-qing Zheng

Journal of the Physical Society of Japan 80 ( Suppl.A ) 2011.1

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DOI： 10.1143/jpsjs.80sa.sa116

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Multiple Superconducting Gaps and Anisotropic Spin Fluctuations in Hole-Doped and Electron-Doped Iron-Pnictides: NMR Studies Reviewed

Guo-qing Zheng, K. Matano, S. Kawasaki, Z. Li, G. L. Sun, D. L. Sun, C. T. Lin, G. F. Chen, J. L. Luo, N. L. Wang, Z. A. Ren, Z. X. Zhao

Journal of Superconductivity and Novel Magnetism 23 ( 5 ) 609 - 612 2010.7

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DOI： 10.1007/s10948-010-0749-1

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Pressure-induced unconventional superconductivity near a quantum critical point in CaFe₂As₂ Invited Reviewed

S Kawasaki, T Tabuchi, X F Wang, X H Chen, Guo-qing Zheng

Superconductor Science and Technology 23 ( 5 ) 054004 - 054004 2010.5

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Authorship：Lead author,　Corresponding author Publishing type：Research paper (scientific journal) Publisher：{IOP} Publishing

DOI： 10.1088/0953-2048/23/5/054004

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Evidence for a full energy gap in the nickel pnictide superconductor LaNiAsO1−xFx from 75As nuclear quadrupole resonance Reviewed

T. Tabuchi, Z. Li, T. Oka, G. F. Chen, S. Kawasaki, J. L. Luo, N. L. Wang, Guo-qing Zheng

Physical Review B 81 ( 14 ) 2010.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.81.140509

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Spin–Echo NMR in Pulsed High Magnetic Fields up to 48 T Reviewed

Guo-qing Zheng, Kouta Katayama, Masahide Nishiyama, Shinji Kawasaki, Naoki Nishihagi, Shojiro Kimura, Masayuki Hagiwara, Koichi Kindo

Journal of the Physical Society of Japan 78 ( 9 ) 095001 - 095001 2009.9

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan

DOI： 10.1143/jpsj.78.095001

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Superconducting state in the noncentrosymmetric Mg9.3Ir19B16.7 and Mg10.5Ir19B17.1 revealed by NMR Reviewed

K. Tahara, Z. Li, H. X. Yang, J. L. Luo, S. Kawasaki, Guo-qing Zheng

Physical Review B 80 ( 6 ) 2009.8

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.80.060503

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Measurement of electron correlations in LixCoO2 (x=0.0–0.35) using 59Co nuclear magnetic resonance and nuclear quadrupole resonance techniques Reviewed

S. Kawasaki, T. Motohashi, K. Shimada, T. Ono, R. Kanno, M. Karppinen, H. Yamauchi, Guo-qing Zheng

Physical Review B 79 ( 22 ) 2009.6

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DOI： 10.1103/physrevb.79.220514

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Two superconducting gaps in LaFeAsO0.92F0.08 revealed by 75As nuclear quadrupole resonance Reviewed

S. Kawasaki, K. Shimada, G. F. Chen, J. L. Luo, N. L. Wang, Guo-qing Zheng

Physical Review B 78 ( 22 ) 2008.12

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.78.220506

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Unconventional superconductivity and antiferromagnetic quantum phase transition in CeRhIn5 : 115In-NQR study under pressure Reviewed

M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Ōnuki

Physica B: Condensed Matter 403 ( 5-9 ) 914 - 916 2008.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/j.physb.2007.10.062

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Sb-NQR Study of PrOs₄Sb₁₂under High Pressure Reviewed

Shinji Kawasaki, Kouta Katayama, Masahide Nishiyama, Hisashi Kotegawa, Tatsuo C. Kobayashi, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Guo-qing Zheng

Journal of the Physical Society of Japan 77 ( Suppl.A ) 330 - 332 2008.1

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DOI： 10.1143/jpsjs.77sa.330

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Pressure dependence of the superconducting transition and electron correlations in NaxCoO2∙1.3H2O Reviewed

E. Kusano, S. Kawasaki, K. Matano, Guo-qing Zheng, R. L. Meng, J. Cmaidalka, C. W. Chu

Physical Review B 76 ( 10 ) 2007.9

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society ({APS})

DOI： 10.1103/physrevb.76.100506

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Antiferromagnetic quantum phase transition in superconducting phase in CeRhIn5 Reviewed

M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Ōnuki

Physica C: Superconductivity and its Applications 460-462 670 - 671 2007.9

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DOI： 10.1016/j.physc.2007.03.035

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Quantum phase diagram of antiferromagnetism and superconductivity with a tetracritical point in CeRhIn5 in zero magnetic field Reviewed

M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Ōnuki

Physical Review B 76 ( 2 ) 2007.7

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DOI： 10.1103/physrevb.76.020509

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Experimental evidence for ferromagnetic spin-pairing superconductivity emerging in UGe2: A 73Ge-nuclear-quadrupole-resonance study under pressure Reviewed

A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Ōnuki, K. M. Itoh, E. E. Haller, H. Harima

Physical Review B 75 ( 14 ) 2007.4

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DOI： 10.1103/physrevb.75.140502

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Novel superconductivity at the magnetic critical point in heavy-fermion systems: a systematic study of NQR under pressure Reviewed

Y Kitaoka, S Kawasaki, Y Kawasaki, T Mito, G-q Zheng

Journal of Physics: Condensed Matter 19 ( 12 ) 125202 - 125202 2007.3

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DOI： 10.1088/0953-8984/19/12/125202

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Pressure-induced antiferromagnetic superconductivity in CeNiGe3 : A 73Ge-NQR study under pressure Reviewed

A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, A. Thamizhavel, Y. Okuda, R. Settai, Y. Ōnuki, K.M. Itoh, E.E. Haller, H. Harima

Journal of Magnetism and Magnetic Materials 310 ( 2 ) 614 - 616 2007.3

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DOI： 10.1016/j.jmmm.2006.10.883

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73Ge-NQR study of heavy-fermion compound CeNi2Ge2 Reviewed

S. Kawasaki, T. Sada, T. Miyoshi, H. Kotegawa, H. Mukuda, Y. Kitaoka, T.C. Kobayashi, T. Fukuhara, K. Maezawa, K.M. Itoh, E.E. Haller

Journal of Magnetism and Magnetic Materials 310 ( 2 ) 590 - 592 2007.3

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DOI： 10.1016/j.jmmm.2006.10.232

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115In-NQR study of CeRh1-xIrxIn5 under pressure Reviewed

Y. Mugino, S. Kawasaki, M. Yashima, H. Mukuda, Y. Kitaoka, H. Shishido, Y. Ōnuki

Journal of Magnetism and Magnetic Materials 310 ( 2 ) 584 - 586 2007.3

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DOI： 10.1016/j.jmmm.2006.10.224

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Novel phase diagram of antiferromagnetism and superconductivity in CeRhIn5 Reviewed

M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Ōnuki

Journal of Magnetism and Magnetic Materials 310 ( 2 ) 322 - 324 2007.3

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DOI： 10.1016/j.jmmm.2006.10.018

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Evidence for Point Nodes in the Superconducting Gap Function in the Filled Skutterudite Heavy-Fermion Compound PrOs₄Sb₁₂: ¹²³Sb-NQR Study under Pressure Reviewed

Kouta Katayama, Shinji Kawasaki, Masahide Nishiyama, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Guo-qing Zheng

Journal of the Physical Society of Japan 76 ( 2 ) 023701 - 023701 2007.2

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DOI： 10.1143/jpsj.76.023701

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Unconventional superconductivity in the itinerant ferromagnet UGe2:73Ge-NQR study under pressure Reviewed

A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Ōnuki, K.M. Itoh, E.E. Haller, H. Harima

Physica B: Condensed Matter 378-380 963 - 964 2006.5

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DOI： 10.1016/j.physb.2006.01.368

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Evidence for the first-order phase transition from antiferromagnetism to paramagnetism in CeRhIn5 Reviewed

M. Yashima, S. Kawasaki, Y. Kitaoka, H. Shishido, R. Settai, Y. Ōnuki

Physica B: Condensed Matter 378-380 94 - 95 2006.5

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DOI： 10.1016/j.physb.2006.01.537

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Unconventional superconductivity and antiferromagnetic quantum criticality in CeRh1-xIrxIn5 Reviewed

S. Kawasaki, M. Yashima, Y. Mugino, H. Mukuda, Y. Kitaoka, H. Shishido, Y. Ōnuki

Physica B: Condensed Matter 378-380 400 - 401 2006.5

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DOI： 10.1016/j.physb.2006.01.152

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Evidence for Unconventional Superconducting Fluctuations in Heavy-Fermion Compound CeNi₂Ge₂ Reviewed

S. Kawasaki, T. Sada, T. Miyoshi, H. Kotegawa, H. Mukuda, Y. Kitaoka, T. C. Kobayashi, T. Fukuhara, K. Maezawa, K. M. Itoh, E. E. Haller

Journal of the Physical Society of Japan 75 ( 4 ) 043702 - 043702 2006.4

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DOI： 10.1143/jpsj.75.043702

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Enhancing the Superconducting Transition Temperature of CeRh1−xIrxIn5 due to the Strong-Coupling Effects of Antiferromagnetic Spin Fluctuations: An 115In Nuclear Quadrupole Resonance Study Reviewed

Shinji Kawasaki, Mitsuharu Yashima, Yoichi Mugino, Hidekazu Mukuda, Yoshio Kitaoka, Hiroaki Shishido, Yoshichika Ōnuki

Physical Review Letters 96 ( 14 ) 2006.4

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DOI： 10.1103/physrevlett.96.147001

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115In-NQR study of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 under pressure Reviewed

S. Kawasaki, M. Yashima, H. Kotegawa, T. Mito, Y. Kawasaki, G.-Q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, D. Aoki, Y. Haga, R. Settai, Y. Ōnuki

Journal of Physics and Chemistry of Solids 67 ( 1-3 ) 497 - 499 2006.1

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DOI： 10.1016/j.jpcs.2005.10.043

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Cooperative Phenomenon of Ferromagnetism and Unconventional Superconductivity in UGe₂: A ⁷³Ge-NQR Study under Pressure Reviewed

A. Harada, S. Kawasaki, H. Kotegawa, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Ōnuki, K. M. Itoh, E. E. Haller, H. Harima

Journal of the Physical Society of Japan 74 ( 10 ) 2675 - 2678 2005.10

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DOI： 10.1143/jpsj.74.2675

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Unconventional superconductivity near the antiferromagnetic criticality in CeCoIn5: a study of 115In-NQR under pressure Reviewed

M. Yashima, S. Kawasaki, Y. Kawasaki, G.-q. Zheng, Y. Kitaoka, H. Shishido, R. Settai, Y. Haga, Y. Ōnuki

Physica B: Condensed Matter 359-361 404 - 406 2005.4

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DOI： 10.1016/j.physb.2005.01.080

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NMR/NQR experiments on heavy-fermion systems and superconductors Reviewed

Y. Kitaoka, S. Kawasaki, Y. Kawasaki, H. Kotegawa, T. Mito

Physica B: Condensed Matter 359-361 341 - 348 2005.4

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DOI： 10.1016/j.physb.2005.01.057

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115In-NQR study of antiferromagnetism and superconductivity near magnetic criticality in CeIn3 Reviewed

S. Kawasaki, T. Mito, Y. Kawasaki, H. Kotegawa, .G.-q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Ōnuki

Physica B: Condensed Matter 359-361 413 - 415 2005.4

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DOI： 10.1016/j.physb.2005.01.083

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Novel phase diagram of superconductivity and ferromagnetism in UGe₂: a⁷³Ge-NQR study under high pressure Reviewed

Y Kitaoka, H Kotegawa, A Harada, S Kawasaki, Y Kawasaki, Y Haga, E Yamamoto, Y Ōnuki, K M Itoh, E E Haller, H Harima

Journal of Physics: Condensed Matter 17 ( 11 ) S975 - S986 2005.3

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DOI： 10.1088/0953-8984/17/11/030

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The phase diagram of antiferromagnetism and superconductivity in CeRhIn₅: a study of¹¹⁵In NQR under pressure Reviewed

S Kawasaki, M Yashima, T Mito, Y Kawasaki, G-q Zheng, Y Kitaoka, D Aoki, Y Haga, Y Ōnuki

Journal of Physics: Condensed Matter 17 ( 11 ) S889 - S893 2005.3

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DOI： 10.1088/0953-8984/17/11/019

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Evidence for Uniform Coexistence of Ferromagnetism and Unconventional Superconductivity in UGe₂: A⁷³Ge-NQR Study under Pressure Reviewed

H. Kotegawa, A. Harada, S. Kawasaki, Y. Kawasaki, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Ōnuki, K. M. Itoh, E. E. Haller, H. Harima

Journal of the Physical Society of Japan 74 ( 2 ) 705 - 711 2005.2

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DOI： 10.1143/jpsj.74.705

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Enhancing the Superconducting Transition Temperature of the Heavy Fermion Compound CeIrIn5 in the Absence of Spin Correlations Reviewed

Shinji Kawasaki, Guo-qing Zheng, Hiroki Kan, Yoshio Kitaoka, Hiroaki Shishido, Yoshichika Ōnuki

Physical Review Letters 94 ( 3 ) 2005.1

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DOI： 10.1103/physrevlett.94.037007

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Unconventional Superconductivity in Heavy-Fermion Systems Reviewed

Y. Kitaoka, S. Kawasaki, T. Mito, Y. Kawasaki

Journal of the Physical Society of Japan 74 ( 1 ) 186 - 199 2005.1

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DOI： 10.1143/jpsj.74.186

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Magnetic Criticality and Unconventional Superconductivity in CeCoIn₅: Study of¹¹⁵In-Nuclear Quadrupole Resonance under Pressure Reviewed

M. Yashima, S. Kawasaki, Y. Kawasaki, G.-q. Zheng, Y. Kitaoka, H. Shishido, R. Settai, Y. Haga, Y. Ōnuki

Journal of the Physical Society of Japan 73 ( 8 ) 2073 - 2076 2004.8

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DOI： 10.1143/jpsj.73.2073

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New Superconducting and Magnetic Phases Emerge on the Magnetic Criticality in CeIn₃ Reviewed

S. Kawasaki, T. Mito, Y. Kawasaki, H. Kotegawa, G.-Q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Ōnuki

Journal of the Physical Society of Japan 73 ( 7 ) 1647 - 1650 2004.7

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DOI： 10.1143/jpsj.73.1647

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Magnetism and superconductivity near the quantum criticality in CeRhIn5 : 115In-NQR study under pressure Reviewed

S Kawasaki, T Mito, Y Kawasaki, G.-q Zheng, Y Kitaoka, D Aoki, Y Haga, Y Onuki

Journal of Magnetism and Magnetic Materials 272-276 E19 - E20 2004.5

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DOI： 10.1016/j.jmmm.2003.11.122

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The microscopic coexistence of superconductivity and ferromagnetism in UGe2: 73Ge-NMR/NQR study Reviewed

H. Kotegawa, S. Kawasaki, A. Harada, Y. Kawasaki, K. Okamoto, G.-q. Zheng, Y. Kitaoka, E. Yamamoto, Y. Haga, Y. Ōnuki, K.M. Itoh, E.E. Haller

Journal of Magnetism and Magnetic Materials 272-276 E27 - E28 2004.5

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DOI： 10.1016/j.jmmm.2003.12.410

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Unconventional superconductivity and antiferromagnetic spin fluctuations in the heavy fermion compound CeCoIn5: 115In-NQR study under pressure Reviewed

M Yashima, S Kawasaki, Y Kawasaki, G.-q Zheng, Y Kitaoka, H Shishido, R Settai, Y Onuki

Journal of Magnetism and Magnetic Materials 272-276 E679 - E681 2004.5

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DOI： 10.1016/j.jmmm.2003.11.335

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Exotic Superconductivity in the Coexistent Phase of Antiferromagnetism and Superconductivity in CeCu₂(Si_0.98Ge_0.02)₂: A Cu-NQR Study under Hydrostatic Pressure Reviewed

Yu Kawasaki, Kenji Ishida, Shinji Kawasaki, Takeshi Mito, Guo-qing Zheng, Yoshio Kitaoka, Christoph Geibel, Frank Steglich

Journal of the Physical Society of Japan 73 ( 1 ) 194 - 197 2004.1

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DOI： 10.1143/jpsj.73.194

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Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn₅: In-NQR and Co-NMR Studies Reviewed

Yu Kawasaki, Shinji Kawasaki, Mitsuharu Yashima, Takeshi Mito, Guo-qing Zheng, Yoshio Kitaoka, Hiroaki Shishido, Rikio Settai, Yoshinori Haga, Yoshichika Ōnuki

Journal of the Physical Society of Japan 72 ( 9 ) 2308 - 2311 2003.9

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DOI： 10.1143/jpsj.72.2308

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Unconventional superconductivity in ferromagnetic UGe₂: a⁷³Ge nuclear magnetic resonance/nuclear quadrupole resonance study Reviewed

H Kotegawa, S Kawasaki, A Harada, Y Kawasaki, K Okamoto, G-q Zheng, Y Kitaoka, E Yamamoto, Y Haga, Y Onuki, K M Itoh, E E Haller

Journal of Physics: Condensed Matter 15 ( 28 ) S2043 - S2046 2003.7

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DOI： 10.1088/0953-8984/15/28/323

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Unconventional superconductivity in CeIn3: 115In-NQR study under pressure Reviewed

Shinji Kawasaki, Yu Kawasaki, Takeshi Mito, Guo-qing Zheng, Yoshio Kitaoka, Shingo Araki, Rikio Settai, Yoshichika Ōnuki

Physica C: Superconductivity 388-389 541 - 542 2003.5

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DOI： 10.1016/s0921-4534(02)02732-6

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Magnetism and superconductivity in CeRhIn5 under chemical and hydrostatic pressures Reviewed

G.-q.Zheng, S. kawasaki, N. Yamaguchi, K. Tanabe, T. Mito, H. Kan, Y. Kitaoka, Y. Haga, D.Aoki, Y. Onuki, J. L. Sarrao, J. D. Thompson

Physica B: Condensed Matter 329-333 450 - 451 2003.5

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DOI： 10.1016/s0921-4526(02)02001-x

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Coexistence of Antiferromagnetism and Superconductivity near the Quantum Criticality of the Heavy-Fermion Compound CeRhIn5 Reviewed

T. Mito, S. Kawasaki, Y. Kawasaki, G. -q. Zheng, Y. Kitaoka, D. Aoki, Y . Haga, Y. Ōnuki

Physical Review Letters 90 ( 7 ) 2003.2

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DOI： 10.1103/physrevlett.90.077004

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Unconventional Superconductivity and Quasi-2D Magnetic Fluctuations in Ce(Ir,Rh)In5 Reviewed International journal

G.-q. Zheng, K. Tanabe, S. Kawasaki, H. Kan, Y. Kitaoka, D. Aoki, Y. Haga, Y. Ōnuki

Acta Physica Polonica B 34 435 - 438 2003

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Magnetic Properties of CeRhIn5 Under Pressure Probed by 115In-NQR Reviewed International journal

S. Kawasaki, T. Mito, G.-q. Zheng, Y. Kawasaki, Y. Kitaoka, D. Aoki, Y. Haga, Y. Ōnuki

Acta Physica Polonica B 34 419 - 422 2003

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115In-NQR evidence for unconventional superconductivity in CeIn3 under pressure Reviewed

S. Kawasaki, T. Mito, Y. Kawasaki, G.-q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Ōnuki

Physical Review B 66 ( 5 ) 2002.8

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DOI： 10.1103/physrevb.66.054521

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Coexistence of antiferromagnetism and superconductivity in heavy-fermion systems Reviewed

Y Kitaoka, Y Kawasaki, T Mito, S Kawasaki, G.-q Zheng, K Ishida, D Aoki, Y Haga, R Settai, Y Ōnuki, C Geibel, F Steglich

Journal of Physics and Chemistry of Solids 63 ( 6-8 ) 1141 - 1146 2002.6

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DOI： 10.1016/s0022-3697(02)00133-6

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Systematic NQR study of the pressure-induced transition from antiferromagnetic to superconducting state in CeRhIn5 Reviewed

Takeshi Mito, Shinji Kawasaki, Guo-qing Zheng, Yu Kawasaki, Kenji Ishida, Yoshio Kitaoka, Dai Aoki, Yoshinori Haga, Yoshichika Ōnuki

Physica B: Condensed Matter 312-313 16 - 18 2002.3

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DOI： 10.1016/s0921-4526(01)01157-7

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Anisotropic Magnetic Fluctuations and Unconventional Superconductivity in the Layered Heavy Fermion Compound CeIrIn₅ Reviewed

Guo-qing Zheng, Kenji Tanabe, Shinji Kawasaki, Yoshio Kitaoka, Dai Aoki, Yoshinori Haga, Yoshichika Ōnuki

Journal of the Physical Society of Japan 71 ( Suppl ) 279 - 281 2002.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan

DOI： 10.1143/jpsjs.71s.279

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Evolution of the Magnetism and Superconductivity in CeRhIn₅under Pressure:¹¹⁵In-NQR Study Reviewed

Shinji Kawasaki, Takeshi Mito, Guo-qing Zheng, Yu Kawasaki, Kenji Ishida, Yoshio Kitaoka, Dai Aoki, Yoshinori Haga, Yoshichika Ōnuki

Journal of the Physical Society of Japan 71 ( Suppl ) 282 - 284 2002.1

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DOI： 10.1143/jpsjs.71s.282

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Pressure-temperature phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3: In-115-NQR study under pressure Reviewed

S Kawasaki, T Mito, GQ Zheng, C Thessieu, Y Kawasaki, K Ishida, Y Kitaoka, T Muramatsu, TC Kobayashi, D Aoki, S Araki, Y Haga, R Settai, Y Onuki

PHYSICAL REVIEW B 65 ( 2 ) 2002.1

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We report the pressure (P)-temperature (T) phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 revealed by the In-115 nuclear-spin-lattice-relaxation (T-1) measurement. In the itinerant magnet CeRhIn5, we found that the Neel temperature T-N is reduced at P greater than or equal to 1.23 GPa with an emergent pseudogap behavior. In CeIn3, the localized magnetic character is robust against the application of pressure up to Psimilar to1.9 GPa, beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations.

DOI： 10.1103/PhysRevB.65.020504

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(formula presented)-NQR evidence for unconventional superconductivity in (formula presented) under pressure Reviewed

S. Kawasaki, T. Mito, Y. Kawasaki, G. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Ōnuki

Physical Review B - Condensed Matter and Materials Physics 66 ( 5 ) 1 - 4 2002

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We report evidence for unconventional superconductivity in (formula presented) at a pressure (formula presented) above the critical pressure (formula presented) revealed by measurements of the nuclear-spin-lattice-relaxation time (formula presented) and ac susceptibility (ac- (formula presented) Both measurements of (formula presented) and ac- (formula presented) have pointed to a superconducting transition at (formula presented) which is much lower than the onset temperature (formula presented) at zero resistance. The temperature dependence of (formula presented) shows no coherence peak just below (formula presented) indicative of an unconventional nature for the superconductivity induced in (formula presented). © 2002 The American Physical Society.

DOI： 10.1103/PhysRevB.66.054521

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Pressure-temperature phase diagram of antiferromagnetism and superconductivity in (formula presented) and (formula presented) (formula presented) study under pressure Reviewed

S. Kawasaki, T. Mito, G. Zheng, C. Thessieu, Y. Kawasaki, K. Ishida, Y. Kitaoka, T. Muramatsu, T. C. Kobayashi, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Onuki

Physical Review B - Condensed Matter and Materials Physics 65 ( 2 ) 1 - 4 2002

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We report the pressure (formula presented)-temperature (formula presented) phase diagram of antiferromagnetism and superconductivity in (formula presented) and (formula presented) revealed by the (formula presented) nuclear-spin-lattice-relaxation (formula presented) measurement. In the itinerant magnet (formula presented) we found that the Néel temperature (formula presented) is reduced at (formula presented) with an emergent pseudogap behavior. In (formula presented) the localized magnetic character is robust against the application of pressure up to (formula presented) beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations. © 2001 The American Physical Society.

DOI： 10.1103/PhysRevB.65.020504

Scopus

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Pressure-temperature phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3: 115In−NQR study under pressure Reviewed

S. Kawasaki, T. Mito, G.-q. Zheng, C. Thessieu, Y. Kawasaki, K. Ishida, Y. Kitaoka, T. Muramatsu, T. C. Kobayashi, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Ōnuki

Physical Review B 65 ( 2 ) 2001.12

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DOI： 10.1103/physrevb.65.020504

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Pressure-induced anomalous magnetism and unconventional superconductivity in CeRhIn5: In-115-NQR study under pressure

T Mito, S Kawasaki, GQ Zheng, Y Kawasaki, K Ishida, Y Kitaoka, D Aoki, Y Haga, Y Onuki

PHYSICAL REVIEW B 63 ( 22 ) 2001.6

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We report In-115 nuclear-quadrupole-resonance (NQR) measurements of the pressure(P)-induced superconductor CeRhIn5 in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field H-int at the In site is substantially reduced from H-int= 1.75 kOe at P=0 to 0.39 kOe at P=1.23 GPa, while the Neel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment M-Q(P) or the angle theta(P) between the direction of M-Q(P) and the tetragonal c axis is extrapolated to zero at P*=1.6+/-0.1 GPa at which a bulk SC transition is no longer emergent. In the SC state at P=2.1 GPa, the nuclear spin-lattice relaxation rate (115)(1/T-1) has revealed a T-3 dependence without the coherence peak just below T-c, giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed.

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Pressure-induced anomalous magnetism and unconventional superconductivity in CeRhIn5: 115In-NQR study under pressure Reviewed

T. Mito, S. Kawasaki, G.-q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

Physical Review B 63 ( 22 ) 2001.5

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DOI： 10.1103/physrevb.63.220507

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Unique Spin Dynamics and Unconventional Superconductivity in the Layered Heavy Fermion Compound CeIrIn5 : NQR Evidence Reviewed

G.-q. Zheng, K. Tanabe, T. Mito, S. Kawasaki, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

Physical Review Letters 86 ( 20 ) 4664 - 4667 2001.5

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DOI： 10.1103/physrevlett.86.4664

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Pressure-induced anomalous magnetism and unconventional superconductivity in (formula presented) (formula presented)-NQR study under pressure Reviewed

Y. Kawasaki, Y. Onuki, G. q. Zheng, K. Ishida, Y. Kitaoka, S. Kawasaki, T. Mito, D. Aoki, Y. Haga

Physical Review B - Condensed Matter and Materials Physics 63 ( 22 ) 2001

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We report (formula presented) nuclear-quadrupole-resonance (NQR) measurements of the pressure (formula presented)-induced superconductor (formula presented) in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field (formula presented) at the In site is substantially reduced from (formula presented) at (formula presented) to 0.39 kOe at (formula presented) while the Néel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment (formula presented) or the angle (formula presented) between the direction of (formula presented) and the tetragonal c axis is extrapolated to zero at (formula presented) at which a bulk SC transition is no longer emergent. In the SC state at (formula presented) the nuclear spin-lattice relaxation rate (formula presented) has revealed a (formula presented) dependence without the coherence peak just below (formula presented) giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed. © 2001 The American Physical Society.

DOI： 10.1103/PhysRevB.63.220507

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In-NQR study of CeIn3 under pressure Reviewed

C Thessieu, K Ishida, S Kawasaki, T Mito, Y Kawasaki, G.-q Zheng, Y Kitaoka, Y Onuki

Physica B: Condensed Matter 281-282 9 - 11 2000.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV}

DOI： 10.1016/s0921-4526(99)01170-9

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Ru-NMR study of pseudo-metamagnetic transition in CeRu₂Si₂ Reviewed

Y. Kawasaki, K. Ishida, Y. Kitaoka, K. Asayama, H. Nakamura, J. Flouquet

Physica B: Condensed Matter 259-261 77 - 78 1999

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DOI： 10.1016/S0921-4526(98)00622-X

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MISC

大きいフェルミ面と量子臨界点の協奏が生み出す奇妙な超伝導 Invited Reviewed

川崎慎司, 鄭国慶

日本物理学会誌 77 ( 6 ) 321 2022.6

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Authorship：Lead author,　Corresponding author Language：Japanese

DOI： 10.11316/butsuri.77.6_361

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銅酸化物高温超伝導体における擬ギャップと磁場誘起電荷密度波- Bi2Sr2-xLaxCuO6+δの場合- Invited Reviewed

川崎慎司, 鄭国慶

日本物理学会誌 73 ( 8 ) 558 2018.8

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DOI： 10.11316/butsuri.73.8_558

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High quality single crystal growth of and NMR measurements for the spin-triplet superconductor K₂Cr₃As₃

小川晟吾, 三好智己, 俣野和明, 川崎慎司, 稲田佳彦, ZHENG G.-q.

日本物理学会講演概要集(CD-ROM) 79 ( 1 ) 2024

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Single Crystal Growth and Characterization of topological superconductor Cu_xBi₂Se₃: IV

西垣颯, 峰明日香, 横山武蔵, 俣野和明, 神戸高志, 川崎慎司, ZHENG G.-q.

日本物理学会講演概要集(CD-ROM) 77 ( 1 ) 2022

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Superconductivity and spin fluctuations in non-centrosymmetric superconductor (Nb,Ta)Rh₂B₂

俣野和明, 小椋亮, FOUNTAINE Mateo, JESCHKE Harald O., 川崎慎司, ZHENG G.-q.

日本物理学会講演概要集(CD-ROM) 77 ( 1 ) 2022

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Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh_0.5Ir_0.5In₅

川崎慎司, 岡利英, 反り目章, 小亀雄司, 上本和宏, 俣野和明, GUO J., CAI S., SUN Liling, SARRAO J. L., THOMPSON J. D., ZHENG Guo-qing, ZHENG Guo-qing

日本物理学会講演概要集(CD-ROM) 76 ( 1 ) 2021

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キラル結晶構造を持つ空間反転対称性の破れた超伝導体(Ta,Nb)Rh₂B₂のNMR測定

小椋亮, FOUNTAINE Mateo, 俣野和明, 川崎慎司, ZHENG Guo-qing

日本物理学会講演概要集(CD-ROM) 74 ( 2 ) 2019

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22aBA-5 NMR/NQR study of Ca_<1-x>La_xFeAs_2

Mabuchi T., Kawasaki S., Mizukami T., Kudo K., Nohara M., Zheng G. -q.

Meeting Abstracts of the Physical Society of Japan 70 2059 - 2059 2015

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.70.1.0_2059

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21pBA-3 NMR study of Sr_2VFeAsO_3

Ueshima K., Han F., Zhu X., Wen Hai-Hu, Kawasaki S., Zheng Guo-qing

Meeting Abstracts of the Physical Society of Japan 70 1989 - 1989 2015

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.70.1.0_1989

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鉄ヒ素系超伝導体のAs-NQRによる研究

川崎慎司, 俣野和明, 島田健史, 岡利英, 大江陽介, ZHENG G.-Q., CHEN G. F., LUO J. L., WAN N. L.

日本物理学会講演概要集 64 ( 1 ) 2009

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鉄ヒ素系超伝導体のAs-NMRによる研究

俣野和明, 田原圭介, 川崎慎司, ZHENG G.-Q., REN Z. A., DONG X. L., SUN L., ZHAO Z. X.

日本物理学会講演概要集 64 ( 1 ) 2009

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LaNiAsO_1-xF_xのNMRによる研究

田渕貴久, 俣野和明, 川崎慎司, ZHENG G.-q., LI Z., CHEN G.F., LUO J.L., WANG N.L.

日本物理学会講演概要集 63 ( 2 ) 2008

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REO_1-xF_xFeAsのNMRによる研究

島田健史, 俣野和明, 田原圭介, 川崎慎司, ZHENG G.-q., REN Z.A., DONG X.L., SUN L., ZHAO Z.X.

日本物理学会講演概要集 63 ( 2 ) 2008

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Na_xCoO₂・1.3H₂Oの高圧下⁵⁹Co-NQRによる研究(III)

草野江理, 俣野和明, 川崎慎司, ZHENG G-Q., CMAIDALKA J., MENG R. L., CHU C. W.

日本物理学会講演概要集 62 ( 2 ) 2007

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NQR study near the critical pressure region in CeRhIn_5

Mito T., Kawasaki S., Zheng G. -q., Kawasaki Y., Ishida K., Kitaoka Y., Haga Y., Inada Y., Tokiwa Y., Aoki D., Onuki Y.

Meeting abstracts of the Physical Society of Japan 56 ( 1 ) 548 - 548 2001.3

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.56.1.3.0_548_3

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NQR study of pressure-induced superconductivity in CeRhIn_5

Mito T., Kawasaki S., Zheng G. -q., Kawasaki Y., Ishida K., Kitaoka Y., Haga Y., Inada Y., Tokiwa Y., Aoki D., Onuki Y.

Meeting abstracts of the Physical Society of Japan 55 ( 2 ) 473 - 473 2000.9

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Language：Japanese Publisher：The Physical Society of Japan (JPS)

DOI： 10.11316/jpsgaiyo.55.2.3.0_473_4

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Presentations

最適ドープBi2201超伝導体におけるひずみ誘起電荷密度波秩序 : 一軸ひずみ下NMR

川崎慎司

京都大学基礎物理学研究所研究会「超伝導研究の発展と広がり」 2023.12.20

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Event date： 2023.12.20 - 2023.12.22

Presentation type：Oral presentation (general)

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単層型銅酸化物Bi2201超伝導体の一軸ひずみ下NMR

川崎慎司

東北大学金属材料研究所材料科学国際共同利用・共同研究拠点ワークショップ, 強磁場NMR 研究会：20 T 超定常強磁場を用いたNMR による物性研究 2023.12.11

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Event date： 2023.12.11 - 2023.12.12

Presentation type：Oral presentation (general)

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Charge-density-wave order in single-layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ superconductor Invited

S. Kawasaki, D. Kamijima, M. Kitahashi, Z. Li, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

Spectroscopies in Novel Superconductors (SNS2019) 2019.6.21

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Event date： 2019.6.16 - 2019.6.21

Language：English Presentation type：Oral presentation (invited, special)

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Charge-Density-Wave Order and Pseudogap in Single Layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ Superconductor」

S. Kawasaki, Z. Li, M. Kitahashi, D. Kamijima, M. Ito, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018) 2018.8.23

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Event date： 2018.8.19 - 2018.8.24

Language：English Presentation type：Oral presentation (general)

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Doping dependence of the charge density wave order in single layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ superconductors revealed by high field NMR Invited

Shinji Kawasaki

International Symposium on Frontier of Superconductivity Research (VI)-NMR and $\mu$SR on Unconventional Superconductors- 2016.10.27

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Event date： 2016.10.26 - 2016.10.29

Language：English Presentation type：Oral presentation (invited, special)

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銅酸化物高温超伝導体Bi2201における磁場誘起CDW Invited

川崎慎司

金属材料研究所強磁場超伝導材料研究センター研究会「20テスラ超強磁場NMRによる物性研究２」 2015.11.10

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Event date： 2015.11.10 - 2015.11.11

Language：Japanese Presentation type：Oral presentation (invited, special)

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銅酸化物高温超伝導体Bi2201の擬ギャップと超伝導 Invited

川崎慎司

金属材料研究所強磁場超伝導材料研究センター研究会「20テスラ超強磁場NMRによる物性研究」

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Event date： 2013.11.18 - 2013.11.19

Language：Japanese Presentation type：Oral presentation (invited, special)

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NMR/NQR study of high-$T_c$ cuprate and iron pnictide Invited

Shinji Kawasaki

International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials

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Event date： 2012.10.1 - 2012.10.3

Language：English Presentation type：Oral presentation (invited, special)

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Superconductivity in CeIrIn$_5$ under chemical and hydrostatic pressures: $^{115}$In-NQR study Invited

Shinji Kawasaki

Joint Workshop on NQP-skutterudites and NPM in multi-approach 2005.11

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Event date： 2005.11.21 - 2005.11.24

Language：Japanese Presentation type：Oral presentation (invited, special)

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単層型銅酸化物Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$超伝導体における一軸ひずみ下 NMR

川崎慎司

高温超伝導フォーラム第10回会合 2023.9.25

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Bi2201 の一軸ひずみ下NMR

川崎慎司

第一回核磁気共鳴法を用いた物性研究討論会 2023.9.25

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Language：Japanese Presentation type：Oral presentation (general)

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銅酸化物高温超伝導体Bi$_2$Sr$_{2-x}$La$_x$CuO$_6$の一軸ひずみ下NMR

佃菜桜, 川崎慎司, Chengtian Lin, 鄭国慶

日本物理学会2023年春季大会 2023.3.25

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Charge-Density-Wave order and fluctuations in high $T_{\rm c}$ cuprates

Shinji Kawasaki

Mini Symposium on Recent Progress in High-temperature and Unconventional Superconductivity 2022.6.8

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Possible odd-frequency gapless superconductivity in CeRh$_{0.5}$Ir$_{0.5}$In$_5$

Shinji Kawasaki

Progress in Superconductivity Research– RIIS Mini-Workshop – hosted by Research Institute for Interdisciplinary Science and Department of Physics, Okayama University, Japan 2022.5.13

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重い電子系反強磁性超伝導体CeRh$_{0.5}$Ir$_{0.5}$In$_5$における局在・遍歴転移とギャップレス超伝導

川崎慎司, 岡利英, 反り目章, 小亀雄司, 上本和宏, 俣野和明, J. Guo, S. Cai, Liling Sun, J. L. Sarrao, J, D. Thompson, 鄭国慶

日本物理学会第76回年次大会 2021.3.14

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Bi2201における磁場誘起電荷密度波と擬ギャップ Invited

川崎慎司

日本物理学会第73回年次大会 (領域８シンポジウム(一般)「超伝導体における新奇な対称性の破れ」 2018.3.24

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Doping-enhanced antiferromagnetism in Ca$_{1-x}$La$_x$FeAs$_2$ revealed by $^{75}$As nuclear magnetic resonance and nuclear quadrupole resonance Invited

Shinji Kawasaki

2015.12.10

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銅酸化物高温超伝導体における磁場誘起電荷秩序と擬ギャップ状態 Invited

川崎慎司

CMRC$^{plus}$研究会「量子ビームによる銅酸化物超伝導体研究の最前線」 2015.11.11

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核磁気共鳴(NMR)法を用いた最近の超伝導研究について-高温超伝導研究の現状- Invited

川崎慎司

2013年度応用物理・物理系学会中国四国支部合同学術講演会(日本物理学会四国支部第１回チュートリアル講演会) 2013.7.28

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量子臨界点由来の新奇超伝導相の核磁気共鳴法による研究 Invited

川崎慎司

日本物理学会第67回年次大会 (領域６，８合同シンポジウム「奇周波数クーパー対の物理」) 2012.3.25

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擬ギャップの基底状態とそのドーピング依存性：超強磁場下NMR Invited

川崎慎司

日本物理学会2011年秋季大会 (領域８シンポジウム「高温超伝導体研究の最近の進展：波数空間と実空間プローブで探る擬ギャップと超伝導ギャップの関係」) 2011.9.23

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ReFeAsOF (Re=La,Pr)の２ギャップ超伝導 Invited

川崎慎司

研究会「鉄ニクタイド物質系における超伝導ペア対称性と超伝導状態」 2009.1.24

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重い電子系超伝導体PrOs$_4$Sb$_{12}$の圧力下Sb-NQR による研究 Invited

川崎慎司

日本物理学会中国支部・四国支部 2007 年度支部学術講演会 2007.8.4

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Novel Superconductivity and Magnetism in CeIn$_3$ and Ce115 Systems: a Study of $^{115}$In-NQR Under Pressure Invited

Shinji Kawasaki

2004.9.12

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Awards

APS Outstanding Referee

2023.2 American Physical Society (APS)

Shinji Kawasaki

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Award type：Honored in official journal of a scientific society, scientific journal Country：United States

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理学部教育貢献賞

2014.3 岡山大学理学部

川崎慎司

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岡山大学学長表彰「若手トップリサーチャー研究奨励賞」

2011.3 岡山大学

川崎慎司

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Research Projects

精密一軸結晶ひずみ制御による非従来型超伝導と背景秩序/揺らぎの起源解明

Grant number：23K03323 2023.04 - 2026.03

日本学術振興会科学研究費助成事業基盤研究(C)

川崎慎司

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Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

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一軸ひずみ応答による銅酸化物高温超伝導と背景電荷密度波秩序/揺らぎの起源解明

2022.01 - 2022.12

公益財団法人村田学術振興財団第38回（2022年度）研究助成

川崎慎司

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Authorship：Principal investigator

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Physics of Spin-triplet superconductivity

Grant number：19H00657 2019.04 - 2023.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

鄭国慶, 俣野和明, 川崎慎司, 市岡優典

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Grant amount：\44590000 （ Direct expense: \34300000 、 Indirect expense：\10290000 ）

（１）強磁性スピンゆらぎが存在するスピン三重項超伝導体K2Cr3As3の高品質単結晶の作製に成功した。
（２）K2Cr3As3の関連物質Cs2Cr3As3において、１K以下の低温まで磁化率測定を行い、この物質の本質的な超伝導転移が1.2Kで起こるが、磁場をc軸に平行にかけると、フィラメント的な超伝導が現れることを明らかにした。
（３）カゴメ構造をもつ超伝導体CsV3Sb5における電荷密度波の構造がダビット星型であることを明らかにした。
（４）スピン三重項超伝導体CuxBi2Se3において、磁場によってベクトル秩序変数の制御に成功した。スピン三重項超伝導体CuxBi2Se3のベクトル秩序変数の方向が結晶軸からずれることを発見した。また、その理由はフォノンとの結合であることを明らかにした。
（５）スピン三重項超伝導体CuxBi2Se3の超伝導軌道関数（ギャップ対称性）がpxの対称性を持つことを明らかにした。

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Nuclear Magnetic Resonance study of the charge density wave order in the Cu oxide superconductor

Grant number：19K03747 2019.04 - 2022.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Kawasaki Shinji

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Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

We have conducted nuclear magnetic resonance (NMR) experiments to elucidate the origin of the novel charge density wave order in Cu-oxide (cuprate) superconductor, which is the most promising candidate for room-temperature superconductivity among known superconductors. From systematic measurements, we have obtained new findings that indicate the importance of "charge fluctuation" in addition to spin fluctuation, which has been believed to be the origin of high-temperature superconductivity. Based on our results, further developments of physics of the cuprate superconductivity in theoretical and experimental studies focusing on charge fluctuations are expected. Another purpose of the study was to introduce uniaxial strain, a new external parameter that has recently been the focus of much attention in condensed matter physics, into NMR experiments, and we succeeded in developing an laboratory-made piezoelectric uniaxial strain cell during the research period.

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単層型銅酸化物高温超伝導体における電荷密度波・擬ギャップ・超伝導の起源解明

2018.10 - 2019.09

住友電工グループ社会貢献基金 2018年度学術・研究助成

川崎慎司

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Authorship：Principal investigator

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NMR study on novel superconductivity in materials with special structures

Grant number：16H04016 2016.04 - 2019.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Zheng Guo-qing

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Grant amount：\17810000 （ Direct expense: \13700000 、 Indirect expense：\4110000 ）

The purpose of this project is to search for novel superconducting state in materials with triangular or hexagonal lattices. Some of the materials we studied lack spatial inversion center, and thus anti-symmetric spin-orbit coupling is enhanced which can induce spin-triplet superconducting state. Others have van Hove singularity in the electronic band structure which is favored by unconventional superconducting states. We performed nuclear magnetic resonance (NMR) measurements to study the temperature, magnetic-field, and crystal axis dependence of the spin-lattice relaxation rate and Knight shift. Through these measurements, we have revealed the exotic properties of several materials.

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NMR study on unconventional superconductivity and novel quantum phenomena in strongly correlated electron systems under extreme condition

Grant number：25400374 2013.04 - 2016.03

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Kawasaki Shinji, ZHENG Guo-qing

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Grant amount：\4810000 （ Direct expense: \3700000 、 Indirect expense：\1110000 ）

(1)NMR study of Sr2VFeAsO3 under high pressure; In iron based high temperature superconductor Sr2VFeAsO3, we found an antiferromagnetic order above Tc and obtained novel pressure-temperature phase diagram of superconductivity and antiferromagnetism. (2)High temperature NMR study in SrPt2As2 superconductor; We found multiple charge density wave orders in SrPt2As2, which coexist with superconductivity by NMR measurement up to 600K. (3)High pressure NQR and resistivity measurements on CeRhIrIn5; We found that a unconventional superconducting state is induced near the antiferromgnetic quantum critical point in CeRhInIn5. (4)NMR study in Ce1-xLaxFeAs2; We found electron doping enhanced antiferromagnetism and its coexistence with high temperature superconductivity in Ce1-xLaxFeAs2. (5) High field NMR study in high Tc cuprate; By applying high magnetic field up to 45T, we found a CDW order is induced after suppressing superconductivity in underdoped cuprate.

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重い電子系における量子臨界点由来の新奇超伝導相の核磁気共鳴法による研究

Grant number：23102717 2011.04 - 2013.03

日本学術振興会科学研究費助成事業新学術領域研究(研究領域提案型)

川崎慎司

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Grant amount：\8840000 （ Direct expense: \6800000 、 Indirect expense：\2040000 ）

本研究計画は、重い電子系における反強磁性磁気「量子臨界点」に着目し、低温高圧下核磁気共鳴(NMR)/核四重極共鳴(NQR)測定を通じて量子臨界点と非従来型超伝導の関連を調べている。平成24年度は、本研究計画最終年度であり、重い電子系反強磁性超伝導体CeRh0.5Ir0.5In5の低温高圧下NQR実験を通じ、量子臨界点と量子臨界点における超伝導ギャップ構造に注目し、その圧力相図を完成させた。
具体的には、CeRh0.5Ir0.5In5におけるIn-NQRスピン格子緩和時間（T1）の常伝導状態の温度依存性から、反強磁性揺らぎが絶対零度に向けて発散する圧力、つまり量子臨界点がPc＝1.2GPaであることがわかった。同時に、圧力下のTc測定から、CeRh0.5Ir0.5In5の超伝導転移温度が量子臨界点で最大値Tc＝1.4Kを示すことがわかった。これは量子臨界点近傍の反強磁性スピン揺らぎがTc上昇を助けていることを示す直接的な証拠である。
また、3He冷凍機を用いた極低温のT1測定から、量子臨界点で超伝導ギャップ内の残留状態密度が極めて大きくなることを見出した。
このことは、量子臨界点でTc最大となる超伝導は、ギャップレス超伝導であることを示す。このようなTc増大を伴うギャップレス超伝導は、過去に知られている超伝導現象では説明出来ない全く新しい現象であり、重い電子系超伝導発現機構解明に向け、新たなきっかけを与える重要な成果であると考えられる。

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NMR study of unconventional superconductivity in strongly correlated electron systems

Grant number：22740232 2010 - 2012

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

KAWASAKI Shinji, ZHENG Guo-qing

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Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

1. NMR study of high-Tccuprate in very high magnetic field; by applying high magnetic field of 45 T, we revealed the pseudogap ground state for high Tc cuprate after suppressing superconductivity for the first time.
2. NMR study of magnetism and superconductivity in iron-pnictide superconductors; we found the phase diagram of iron-pnictide superconductor is similar with high-Tccuprate indicating that magnetism helps to raise Tcin iron-pnictide as well as cuprate.

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PrOs4Sb12における多重極揺らぎと重い電子超伝導の核磁気共鳴法による研究

Grant number：21102514 2009 - 2010

日本学術振興会科学研究費助成事業新学術領域研究(研究領域提案型)

川崎慎司

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Grant amount：\9100000 （ Direct expense: \7000000 、 Indirect expense：\2100000 ）

(1)充填スクッテルダイト化合PrOs_4Sb_<12>の温高圧下Sb-NQR法による研究
充填スクッテルダイト化合物PrOs_4Sb_<12>の重い電子超伝導と四重極揺らぎとの関連を低温高圧下核磁気共鳴法によって調べるために、世界初となる5万気圧を超えるSb-NQR用対向アンビル型圧力セルの開発を行った。この圧力セルはこれまでの高圧下核磁気共鳴法の標準的加圧装置であるピストンシリンダー型(最大圧力3万気圧未満)に比べ、核磁気共鳴には十分な量の試料空間を備えるものである。平成22年度において、室温でおよそ6万気圧の加圧テストに成功した。今後未踏の5万気圧下NMR実験によって、本物質の電子状態解明のみならず、他の系における様々な新しい知見が得られると期待される。
(2)新奇Fe系圧力誘起超伝導体CaFe_2As_2の量子臨界現象と非従来型超伝導に関する研究
鉄系超伝導体は2008年に発見された全く新しい高温超伝導体であり、その超伝導状態や発現機構は不明である。本研究課題では世界に先駆けて単結晶CaFe_2As_2(P_c～5kbar,T_c～5K)を用いた系統的な低温高圧下As-NMR/NQR実験を行った。その結果、超伝導のクーパー対の対称性が、加圧によってギャップレス超伝導から、d波的な超伝導へと転移する(圧力依存性を示す)ことがわかった。このことは本物質の超伝導が、「量子臨界点」近傍で発現していることを示す。また、常伝導状態の電子状態の圧力依存性から、鉄のd電子による多バンド構造由来のスピン揺らぎが超伝導発現に重要な役割を果たしていることを明らかにした。本研究成果は、鉄系超伝導が重い電子系超伝導と普遍的な性質を持つことを示すものであり、量子臨界点を通じた系統的な理解が今後期待される。

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Novel Physics of non-centrosymmetric superconductors

Grant number：20244058 2008 - 2011

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

ZHENG Guo-qing, INADA Yoshihiko, KAWASAKI Shinji, ICHIOKA Masanori, SAKURAI Yoshiharu

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Grant amount：\47320000 （ Direct expense: \36400000 、 Indirect expense：\10920000 ）

We have grown polycrystal samples of non-centrosymmetric superconductors Li_2(Pt_<1-x> Pd_x)_3B and studied the evolution of the superconducting state by NMR. We found that the superconducting state changes abruptly at x~ 0. 8. By analyzing the crystal structure, we found that the Pt(Pd) B_6 tilts abruptly beyond x~ 0. 8, which enhances the spin-orbit coupling and is responsible for the change in the superconducting state properties. We have also studied other non-centrosymmetric superconductors such as Mg_10Ir_19B_16 and Re_7B_3. The results also suggest that the local structure distortion is effective in enhancing the degree of inversion symmetry-breaking.

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Electrochemical oxidation and electronic structure of transition-metal dioxides

Grant number：19740201 2007 - 2008

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

MOTOHASHI Teruki, YAMAUCHI Hisao, KARPPINEN Maarit, KANNO Kanno, ZHENG Guo-qing

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Grant amount：\3340000 （ Direct expense: \3100000 、 Indirect expense：\240000 ）

本研究では、電子相関効果やスピンフラストレーション効果が期待される層状遷移金属二酸化物の電気化学的強酸化合成とその電子構造の解明を目的とした。特に、巨大熱起電力や超伝導の発見により注目を集めている層状コバルト酸化物の一種であるLixCoO2系について、Li量 (x) を幅広く制御した高品質試料の合成と物性評価を行い、Li量 (x) をパラメータとする電子状態図を構築した。

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圧力誘起磁気量子相転移と重い電子系超伝導の極低温高圧下NMR/NQR法による研究

Grant number：17740225 2005 - 2007

日本学術振興会科学研究費助成事業若手研究(B)

川崎慎司

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Grant amount：\3500000 （ Direct expense: \3500000 ）

・重い電子系充填スクッテルダィト化合物PrOs_<4>Sb_<12>の超伝導相図の確立
PrOs_<4>Sb_<12>の超伝導はその4f電子の結晶場励起と密接に関連していることが多くの実験事実から示唆されていた。この結晶場を実験的に制御(加圧)し、超伝導との関連を調べることが期待される。本研究では、インデンター型圧力セルを核磁気共鳴測定に新たに導入し、これまでは微視的測定では到達が困難であった3GPa以上でのSb-NQR測定に成功し、3GPaを超える圧力下でこの物質の結晶場励起に関する情報を世界で初めて報告した。またPrOs_<4>Sb_<12>の超伝導と、結晶場の関係について微視的視点から圧力相図を明らかにした。
・重い電子系反強磁性体Celn_3の圧力相図の確立。
重い電子系超伝導はいわゆる量子臨界点近傍(絶対零度での二次相転移点近傍)で発現することが広く信じられている。本研究では詳細な低温高圧下NQR測定から、重い電子系化合物Celn_3の反強磁性一常磁性量子相転移は一次相転移であることを明らかにし、圧力誘起超伝導はその一次相転移点近傍で誘起される新奇な量子臨界現象を媒介として発現するという、これまでの常識を覆す全く新しい事実を見出した。
・Na_<x>CoO_2・yH_2O超伝導の圧力効果。
層状Co酸化物超伝導体Na_<x>CoO_2・yH_2Oは、同じ3d電子を舞台とする銅酸化物高温超伝導体との系統性からも世界的に注目されている。本研究では低温高圧下NMR/NQR測定からNa_<x>CoO_2・yH_2Oの超伝導の圧力相図を確立し、圧力下におけるこの物質の異方的超伝導と電子相関の関連を世界で初めて明らかにした。

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圧力誘起重い電子系超伝導体の極低温高圧下NMR/NQR法による磁性と超伝導の研究

Grant number：03J03938 2003 - 2004

日本学術振興会科学研究費助成事業特別研究員奨励費

川崎慎司

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Grant amount：\1900000 （ Direct expense: \1900000 ）

本研究では、加圧によっ,て重い電子系の磁性と超伝導の相関、そして超伝導発現機構の解明をめざしている。
また、重い電子系超伝導体CeIrIn_5の圧力下NQR測定によって、重い電子系化合物における新たな超伝導発現機構の存在を示唆する結果を得た。
具体的な成果は以下の通り。
1.重い電子系反強磁性圧力誘起超伝導体CeIn_3の圧力誘起反強磁性-常磁性転移が一次相転移であり、超伝導はその一次転移近傍で発現することを明らかにした。電気抵抗測定から強く示唆されていた量子臨界点の存在を否定する初めての結果を得た。この結果は、これまで量子臨界点近傍の強い磁気揺らぎによって誘起されていると考えられてきた重い電子系超伝導発現機構に、一次相転移という新たなキーワードを付与する重要な結果である。また、強磁性圧力誘起超伝導体UGe_2においても強磁性-常磁性転移が一次相転移であることを見出し、一次の磁気相転移が超伝導発現に果たす役割が、重い電子系において系統的に理解される可能性を示唆する。
2.常圧でT_c=0.4 Kの超伝導体であるCeIrIn_5は、IrをRhで置換すると、負の圧力効果から、反強磁性秩序が誘起され、かつ超伝導転移温度(T_c)が上昇することが報告されており[1]、Ce115系における超伝導が磁気揺らぎによって誘起されていることが強く示唆される。一方CeIrIn_5を加圧する(磁性から遠ざける)ことでも超伝導転移温度は上昇する[2-4]。この時常伝導状態は、T_cが増大するにも関わらず、核磁気緩和率の温度依存性からフェルミ液体状態であることを見出した。つまり高圧下のCeIrIn_5の超伝導は磁気揺らぎとは異なる起源で誘起されていることがわかった。このことは、Ce115系、ひいては重い電子系超伝導体において、磁気揺らぎと、もう一つ異なる超伝導発現機構が存在するというこれまでにない新たな重要な知見を得た。
[1] G.-q. Zheng, Phys.Rev.B 70,014511(2004). [2] T.Muramatsu et al.,Physica C 388-389,539(2003).[3] R.Borth et al.,Physica B 312-313,136(2002). [4] S.Kawasaki et al.,Phys.Rev.Lett. 94,037007(2005).

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