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

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Title: Fluctuating superconductivity in kappa-type organic compounds probed by polarized time-resolved spectroscopy
Authors: Nakagawa, Koichi Browse this author
Tsuchiya, Satoshi Browse this author
Yamada, Jun-ichi Browse this author
Toda, Yasunori Browse this author →KAKEN DB
Issue Date: Jun-2018
Publisher: IOP Publishing
Journal Title: EPL
Volume: 122
Issue: 6
Start Page: 67003
Publisher DOI: 10.1209/0295-5075/122/67003
Abstract: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/74508
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中川 紘一

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