Abstract
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.
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