Volume 122, Number 6, June 2018
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.