Microscopic observation of superconducting fluctuations in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br by C-13 NMR spectroscopy

Kobayashi, T.; Ihara, Y.; Saito, Y.; Kawamoto, A.

Microscopic observation of superconducting fluctuations in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br by C-13 NMR spectroscopy

Kobayashi, T.; Ihara, Y.; Saito, Y. et al.

Physical Review B, 2014, 89(16), 165141

Permalink : https://hdl.handle.net/2115/56546

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アクセス権	open access
URI	https://hdl.handle.net/2115/56546
タイトル	Microscopic observation of superconducting fluctuations in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br by C-13 NMR spectroscopy
著者	Kobayashi, T. ; Ihara, Y. ; Saito, Y. ; Kawamoto, A.
著者名 Kobayashi, T.
e-Rad_Researcher 80598491 著者名 Ihara, Y.
著者名 Saito, Y.
e-Rad_Researcher 60251691 著者名 Kawamoto, A.
言語	英語
発行日	2014-04-30
出版者	American Physical Society
収録物名	Physical Review B
巻(号)	89(16)
ページ	165141
抄録	We performed C-13-NMR experiment and measured spin-lattice relaxation rate divided by temperature 1/T1T near the superconducting (SC) transition temperature T-c in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)] Br (kappa-Br salt), and kappa-(BEDT-TTF)(2)Cu(NCS)(2) (kappa-NCS salt). We observed the reduction of 1/T1T starting at the temperature higher than T-c in kappa-Br salt. Microscopic observation of the quasiparticle density of states in the fluctuating SC state revealed the effects of short-range Cooper pairs induced in the normal state to the quasiparticle density of states. We also performed systematic measurements in the fields both parallel and perpendicular to the conduction plane in kappa-Br and kappa-NCS salts, and confirmed that the reduction of 1/T1T above T-c is observed only in kappa-Br salt regardless of the external field orientation.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	©2014 American Physical Society
PISSN	1098-0121
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1103/PhysRevB.89.165141