Faculty Profiles - Kasahara Shigeru

MISC - Kasahara Shigeru

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24pYA-1 Effects of impurity scattering induced by electron irradiation in iron-based superconductors BaFe_2(As_<1-x>P_x)_2

Mizukami Y, Hashimoto K, Kasahara S, Katsumata R, Goh S. K, van der Beek C. J, Konczykowski M, Terashima T, Shibauchi T, Matsuda Y

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 554 - 554 2012.3

27pYA-2 Anisotropy of the superconducting gap of BaFe_2(As_<1-x>P_x)_2

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

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 695 - 695 2012.3

25pYA-3 Coexistence and competition between magnetism and superconductivity in iron-based superconductors BaFe_2(As_<1-x>P_x)_2

Iye T, Nakai Y, Kitagawa S, Ishida K, Kasahara S, Shibauchi T, Matsuda Y, Terashima T

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 633 - 633 2012.3

24pYA-12 Emergent Nemaic Phase in Iron-based Superconductors

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

Meeting abstracts of the Physical Society of Japan 67 ( 1 ) 557 - 557 2012.3

High-resolution thermal expansion of isovalently substituted BaFe2(As1-xPx)(2) Reviewed

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

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011) 391 ( 1 ) 2012

Language：English Publisher：IOP PUBLISHING LTD

We have investigated the isovalently substituted system BaFe2(As1-xPx)(2) by high-resolution thermal expansion using a home-built capacitive dilatometer. Accurate measurements succeeded despite the very small size of the available single crystals (similar to 500 x 500 x 100 mu m(3)). Information on the uniaxial pressure derivatives of the transition temperatures is obtained using thermodynamic relations. In-plane and out-of-plane pressure derivatives have opposite sign, which demonstrates the sensitivity of the compound to uniaxial pressure. The structural and the superconducting transition always respond oppositely to uniaxial pressure, which signals their coupling and competition.

DOI： 10.1088/1742-6596/391/1/012122

Web of Science

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P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)(2) Reviewed

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

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011) 391 ( 1 ) 2012

Language：English Publisher：IOP PUBLISHING LTD

P-31-NMR measurements were performed in the iron pnictides BaFe2(As1-xPx)(2) for 0.07 <= x <= 0.64 in order to investigate evolution of electronic state with isovalent substitution. In general, the spin part of the Knight shift K-spin and (T1T)(-1/2) are proportional to the quasiparticle density of states at the Fermi level N(E-F) at high temperature where the Korringa relation holds. We found that K-spin and (T1T)-(1/2) are almost unaffected by the P-substitution, indicating that N (E-F) is nearly constant. These results are quantitatively consistent with our band calculation. We claim that the slight changes of N(E-F) by P-substitution in BaFe2(As1-xPx)(2) is not enough to explain the T-c variation ranging from 30 K to 0 K, and thus suggest that antiferromagnetic correlations related to the quantum critical character are essential for the high T-c superconductivity.

DOI： 10.1088/1742-6596/391/1/012127

Web of Science

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LaFeAsO_1-yの最適ドープ試料における磁場侵入長測定から見た超伝導ギャップ構造

水上雄太, 川本雄太, GOH S. K., 笠原成, 石角元志, 石角元志, 石角元志, 石田茂之, 石田茂之, 鬼頭聖, 鬼頭聖, 伊豫彰, 伊豫彰, 永崎洋, 永崎洋, 社本真一, 社本真一, 寺嶋孝仁, 芝内孝禎, 松田祐司

日本物理学会講演概要集 67 ( 2 ) 2012

24aGL-3 Fermi surfaces and the superconducting gap of BaFe_2(As_<1-x>P_x)_2

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 643 - 643 2011.8

22pGM-10 The relationship between antiferromagnetism and superconductivity in iron-based superconductors BaFe_2(As_<1-x>P_x)_2

Iye T, Nakai Y, Kitagawa S, Ishida K, Kasahara S, Shibauchi T, Matsuda Y, Terashima T

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 550 - 550 2011.8

22aGM-5 Rotational Symmetry Breaking in the Tetragonal Phase of Iron-based Superconductor BaFe_2(As_<1-x>P_x)_2

Shi H. J, Kasahara S, Okazaki R, Yamashita M, Hashimoto K, Fukuda T, Sugimoto K, Shibauchi T, Terashima T, Matsuda Y

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 503 - 503 2011.8

21pGL-13 Electronic state and the superconductivity investigated in clean single crystals of LiFe(As.P)

Kasahara S, Hashimoto K, Katsumata R, Coldea A. I, Carrington A, Shibauchi T, Matsuda Y, Terashima T

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 488 - 488 2011.8

21pGL-12 Superconducting gap structure in clean single crystals of LiFe(As,P) revealed by magnetic penetration depth measurements

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

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 488 - 488 2011.8

24aGL-11 Doping Dependence of Superconducting Gap Structure and Quantum Criticality in Iron-based Superconductor BaFe_2(As,P)_2

Matsuda Y, Hashimoto K, Katsumata R, Kasahara S, Watanabe D, Sensyu Y, Yamashita M, Ikeda H, Terashima T, Shibauchi T, Carrington A, Cho K, Prozorov R, Tanator M, Vekhter I, Vorontsov A. B

Meeting abstracts of the Physical Society of Japan 66 ( 2 ) 645 - 645 2011.8

BaFe_2(As_<1-x>P_x)_2における3次元フェルミ面形状の組成変化(鉄系高温超伝導の物理,研究会報告)

吉田鉄平, 西一郎, 出田真一郎, 藤森淳, 中島正道, 内田慎一, 笠原成, 寺嶋孝仁, 芝内孝禎, 松田祐司, 池田浩章, 富岡泰秀, 伊藤利充, 木方邦宏, 李哲虎, 伊豫彰, 永崎洋, 久保田正人, 小野寛太, 有田亮太郎

物性研究 96 ( 5 ) 552 - 552 2011.8

^<31>P-NMRによるBaFe_2(As_<1-x>P_x)_2の反強磁性と超伝導の研究(鉄系高温超伝導の物理,研究会報告)

家哲也, 中井祐介, 北川俊作, 石田憲二, 芝内孝禎, 松田祐司, 笠原成, 寺嶋孝仁

物性研究 96 ( 5 ) 566 - 566 2011.8

26aEE-4 Composition dependence of band structure and Fermi surfaces in BaFe_2(As_<1-x>P_x)_2

Nishi I, Ideta S, Yoshida T, Fujimori A, Kasahara S, Terashima T, Shibauchi T, Matsuda Y, Nakajima M, Uchida S, Tomioka Y, Ito T, Kihou K, Lee C, Iyo A, Eisaki H, Kubota M, Ono K, Ikeda H, Arita R

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 2011.3

26aEE-2 Rotational Symmetry Breaking in the Tetragonal Phase of Iron-based Superconductor BaFe_2(As_<1-x>P_x)_2

Shi H.J, Kasahara S, Okazaki R, Yamashita M, Shibauchi T, Terashima T, Matsuda Y

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 587 - 587 2011.3

26aEE-1 Quasiparticle Excitation in Isovalently doped Iron-based Superconductors Investigated by Magnetic Penetration Depth Measurements

Hashimoto K, Katsumata R, Kasahara S, Terashima T, Cho K, Tanator M.A, Prozorov R, Carrington A, Shibauchi T, Matsuda Y

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 587 - 587 2011.3

28aEE-11 NMR study on magnetism and superconductivity in iron-based superconductors BaFe_2(As_<1-x>P_x)_2

Iye T, Nakai Y, Kitagawa S, Ishida K, Kasahara S, Shibauchi T, Matsuda Y, Terashima T

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 667 - 667 2011.3

28aEE-4 NMR/NQR study on CaFe_2(As_<1-x>P_x)_2

Nakai Y, Maegawa H, Kitagawa S, Iye T, Ishida K, Kasahara S, Shibauchi T, Matsuda Y, Terashima T

Meeting abstracts of the Physical Society of Japan 66 ( 1 ) 665 - 665 2011.3

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