研究者詳細 - 笠原　成

論文 - 笠原　成

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Importance of both spin and orbital fluctuations in BaFe2(As1-xPx)2 : Evidence from superconducting gap anisotropy 査読

T. Yoshida, S. Ideta, T. Shimojima, W. Malaeb, K. Shinada, H. Suzuki, I. Nishi, A. Fujimori, K. Ishizaka, S. Shin, Y. Nakashima, H. Anzai, M. Arita, A. Ino, H. Namatame, M. Taniguchi, H. Kumigashira, K. Ono, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. Nakajima, S. Uchida, Y. Tomioka, T. Ito, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, H. Ikeda, R. Arita, T. Saito, S. Onari, H. Kontani

Sci. Rep. 4, 7292 (2014) 2013年1月

掲載種別：研究論文（学術雑誌）

In the iron pnictide superconductors, two distinct unconventional mechanisms 
of superconductivity have been put forth: One is mediated by spin fluctuations 
leading to the s+- state with sign change of superconducting gap between the 
hole and electron bands, and the other is orbital fluctuations which favor the 
s++ state without sign reversal. Here we report direct observation of peculiar 
momentum-dependent anisotropy in the superconducting gap from angle-resolved 
photoemission spectroscopy (ARPES) in BaFe2(As1-xPx)2 (Tc=30 K). The large 
anisotropy found only in the electron Fermi surface (FS) and the nearly 
isotropic gap on the entire hole FSs are together consistent with modified s+- 
gap with nodal loops, which can be theoretically reproduced by considering both 
spin and orbital fluctuations whose competition generates the gap modulation. 
This indicates that these two fluctuations are nearly equally important to the 
high-Tc superconductivity in this system.

arXiv

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Thermodynamic phase diagram, phase competition, and uniaxial pressure effects in BaFe2(As1-xPx)(2) studied by thermal expansion 査読

A. E. Boehmer, P. Burger, F. Hardy, T. Wolf, P. Schweiss, R. Fromknecht, H. von Loehneysen, C. Meingast, H. K. Mak, R. Lortz, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda

PHYSICAL REVIEW B 86 ( 9 ) 2012年9月

Infrared Measurement of the Pseudogap of P-Doped and Co-Doped High-Temperature BaFe2As2 Superconductors 査読

S. J. Moon, A. A. Schafgans, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, M. A. Tanatar, R. Prozorov, A. Thaler, P. C. Canfield, A. S. Sefat, D. Mandrus, D. N. Basov

PHYSICAL REVIEW LETTERS 109 ( 2 ) 2012年7月

Electronic nematicity above the structural and superconducting transition in BaFe2(As1-xPx)(2) 査読

S. Kasahara, H. J. Shi, K. Hashimoto, S. Tonegawa, Y. Mizukami, T. Shibauchi, K. Sugimoto, T. Fukuda, T. Terashima, Andriy H. Nevidomskyy, Y. Matsuda

NATURE 486 ( 7403 ) 382 - 385 2012年6月

A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)(2) 査読

K. Hashimoto, K. Cho, T. Shibauchi, S. Kasahara, Y. Mizukami, R. Katsumata, Y. Tsuruhara, T. Terashima, H. Ikeda, M. A. Tanatar, H. Kitano, N. Salovich, R. W. Giannetta, P. Walmsley, A. Carrington, R. Prozorov, Y. Matsuda

SCIENCE 336 ( 6088 ) 1554 - 1557 2012年6月

Gradual suppression of antiferromagnetism in BaFe2(As1-xPx)(2): Zero-temperature evidence for a quantum critical point 査読

Tetsuya Iye, Yusuke Nakai, Shunsaku Kitagawa, Kenji Ishida, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda, Takahito Terashima

PHYSICAL REVIEW B 85 ( 18 ) 2012年5月

Epitaxial Thin Films of ATiO(3-x)H(x) (A = Ba, Sr, Ca) with Metallic Conductivity 査読

Takeshi Yajima, Atsushi Kitada, Yoji Kobayashi, Tatsunori Sakaguchi, Guillaume. Bouilly, Shigeru Kasahara, Takahito Terashima, Mikio Takano, Hiroshi Kageyama

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 134 ( 21 ) 8782 - 8785 2012年5月

Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe2(As, P)(2) with low energy photons 査読

T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, W. Malaeb, T. Yoshida, S. Ideta, A. Fujimori, T. Kiss, M. Okawa, T. Togashi, C. -T. Chen, S. Watanabe, Y. Nakashima, A. Ino, H. Anzai, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, M. Nakajima, S. Uchida, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, A. Chainani, S. Shin

SOLID STATE COMMUNICATIONS 152 ( 8 ) 695 - 700 2012年4月

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe2(As1-xPx)(2) 査読

Tetsuya Iye, Yusuke Nakai, Shunsaku Kitagawa, Kenji Ishida, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda, Takahito Terashima

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 81 ( 3 ) 2012年3月

Contrasts in electron correlations and inelastic scattering between LiFeP and LiFeAs revealed by charge transport 査読

S. Kasahara, K. Hashimoto, H. Ikeda, T. Terashima, Y. Matsuda, T. Shibauchi

Physical Review B - Condensed Matter and Materials Physics 85 ( 6 ) 2012年2月

Contrasts in electron correlations and inelastic scattering between LiFeP and LiFeAs revealed by charge transport 査読

S. Kasahara, K. Hashimoto, H. Ikeda, T. Terashima, Y. Matsuda, T. Shibauchi

PHYSICAL REVIEW B 85 ( 6 ) 2012年2月

de Haas-van Alphen Study of the Fermi Surfaces of Superconducting LiFeP and LiFeAs 査読

C. Putzke, A. I. Coldea, I. Guillamon, D. Vignolles, A. McCollam, D. LeBoeuf, M. D. Watson, I. I. Mazin, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, A. Carrington

PHYSICAL REVIEW LETTERS 108 ( 4 ) 1 - 47002 2012年1月

Nodal versus Nodeless Behaviors of the Order Parameters of LiFeP and LiFeAs Superconductors from Magnetic Penetration-Depth Measurements 査読

K. Hashimoto, S. Kasahara, R. Katsumata, Y. Mizukami, M. Yamashita, H. Ikeda, T. Terashima, A. Carrington, Y. Matsuda, T. Shibauchi

PHYSICAL REVIEW LETTERS 108 ( 4 ) 047003 - 47003 2012年1月

Volovik effect in a highly anisotropic multiband superconductor: Experiment and theory 査読

Y. Wang, J. S. Kim, G. R. Stewart, P. J. Hirschfeld, S. Graser, S. Kasahara, T. Terashima, Y. Matsuda, T. Shibauchi, I. Vekhter

PHYSICAL REVIEW B 84 ( 18 ) 2011年11月

Nodal gap structure of superconducting BaFe2(As1-xPx)(2) from angle-resolved thermal conductivity in a magnetic field 査読

M. Yamashita, Y. Senshu, T. Shibauchi, S. Kasahara, K. Hashimoto, D. Watanabe, H. Ikeda, T. Terashima, I. Vekhter, A. B. Vorontsov, Y. Matsuda

PHYSICAL REVIEW B 84 ( 6 ) 2011年8月

Specific heat discontinuity, ΔC, at Tc in BaFe2(As0.7P0.3)2-consistent with unconventional superconductivity. 査読

Kim JS, Stewart GR, Kasahara S, Shibauchi T, Terashima T, Matsuda Y

Journal of physics. Condensed matter : an Institute of Physics journal 23 ( 22 ) 222201 - 5 2011年6月

Nesting of electron and hole Fermi surfaces in nonsuperconducting BaFe2P2 査読

B. J. Arnold, S. Kasahara, A. I. Coldea, T. Terashima, Y. Matsuda, T. Shibauchi, A. Carrington

PHYSICAL REVIEW B 83 ( 22 ) 2011年6月

Orbital-Independent Superconducting Gaps in Iron Pnictides 査読

T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, T. Kiss, M. Okawa, T. Togashi, C. -T. Chen, S. Watanabe, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, K. Ohgushi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, A. Chainani, S. Shin

SCIENCE 332 ( 6029 ) 564 - 567 2011年4月

Highly Reduced Anatase TiO2-delta Thin Films Obtained via Low-Temperature Reduction 査読

Atsushi Kitada, Shigeru Kasahara, Takahito Terashima, Kazuyoshi Yoshimura, Yoji Kobayashi, Hiroshi Kageyama

APPLIED PHYSICS EXPRESS 4 ( 3 ) 1 - 35801 2011年3月

Two-Dimensional and Three-Dimensional Fermi Surfaces of Superconducting BaFe2(As1-xPx)(2) and Their Nesting Properties Revealed by Angle-Resolved Photoemission Spectroscopy 査読

T. Yoshida, I. Nishi, S. Ideta, A. Fujimori, M. Kubota, K. Ono, S. Kasahara, T. Shibauchi, T. Terashima, Y. Matsuda, H. Ikeda, R. Arita

PHYSICAL REVIEW LETTERS 106 ( 11 ) 117001 - 117001 2011年3月

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