Faculty Profiles - KAWASAKI Shinji

Papers - KAWASAKI Shinji

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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