Fluctuating superconductivity in kappa-type organic compounds probed by polarized time-resolved spectroscopy

Nakagawa, Koichi; Tsuchiya, Satoshi; Yamada, Jun-ichi et al.

EPL, 2018, 122(6), 67003

Permalink : https://hdl.handle.net/2115/74508

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アクセス権	open access
URI	https://hdl.handle.net/2115/74508
タイトル	Fluctuating superconductivity in kappa-type organic compounds probed by polarized time-resolved spectroscopy
著者	Nakagawa, Koichi ; Tsuchiya, Satoshi ; Yamada, Jun-ichi ; Toda, Yasunori
著者名 Nakagawa, Koichi
著者名 Tsuchiya, Satoshi
著者名 Yamada, Jun-ichi
e-Rad_Researcher 00313106 著者名 Toda, Yasunori
言語	英語
発行日	2018-06
出版者	IOP Publishing
収録物名	EPL
巻(号)	122(6)
ページ	67003
抄録	In this work, polarized time-resolved spectroscopy was carried out to investigate a superconducting (SC) state of the organic compounds kappa-(BEDT-TTF)(2)X (X = Cu(NCS)(2) (kappa-NCS, T-c similar to 9 K) and Cu[N(CN)(2)]Br (kappa-Br, T-c similar to 12 K)), which have different effective electron correlations. We found that the SC response, which was characterized by probe polarization anisotropy with slow relaxation time, decreases steeply at approximately T-c in is kappa-NCS with increasing temperature, corresponding to the closing of the SC gap. On the other hand, in is kappa-Br the SC response persisted significantly above T-c. The results indicate that fluctuating superconductivity (FSC) emerges in kappa-Br but not in kappa-NCS, suggesting that strong electron correlation can play a critical role for FSC.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0295-5075
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1209/0295-5075/122/67003