| Issue |
EPL
Volume 122, Number 6, June 2018
|
|
|---|---|---|
| Article Number | 67003 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/122/67003 | |
| Published online | 01 August 2018 | |
Fluctuating superconductivity in κ-type organic compounds probed by polarized time-resolved spectroscopy
1 Graduate School of Engineering, Hokkaido University - Kita13 Nishi8 Kitaku, Sapporo, Hokkaido 060-8628, Japan
2 Graduate School of Material Science, University of Hyogo - 3-2-1 Kouto, Kamigori- cho, Ako-gun, Hyogo 678-1297, Japan
Received: 4 April 2018
Accepted: 9 July 2018
In this work, polarized time-resolved spectroscopy was carried out to investigate a superconducting (SC) state of the organic compounds κ-(BEDT-TTF)2X (X = Cu(NCS)2 (κ-NCS, Tc ∼ 9K) and Cu[N(CN)2]Br (κ-Br, Tc ∼ 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 
in κ-NCS with increasing temperature, corresponding to the closing of the SC gap. On the other hand, in κ-Br the SC response persisted significantly above . The results indicate that fluctuating superconductivity (FSC) emerges in κ-Br but not in κ-NCS, suggesting that strong electron correlation can play a critical role for FSC.
PACS: 74.70.Kn – Organic superconductors / 78.47.jg – Time resolved reflection spectroscopy
© EPLA, 2018
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