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概要
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To investigate the superconducting (SC) state near a charge instability, we performed <sup>13</sup>C NMR experiments on the molecular superconductor \beta''-(BEDT-TTF)<inf>4</inf>[(H<inf>3</inf>O)Ga(C<inf>2</inf>O<inf>4</inf>)<inf>3</inf>]\cdotC<inf>6</inf>H<inf>5</inf>NO<inf>2</inf>[BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene], in which charge disproportionation was reported from Raman spectroscopy at 100 K. We found an NMR spectral splitting at T_{\text{CD}}=12 K, which is ascribed to the low-temperature charge instability. Measurements of nuclear spin--lattice relaxation time revealed enhanced fluctuations at T_{\text{CD}}. We suggest the relationship between the enhanced fluctuations and superconductivity, which emerges slightly below T_{\text{CD}}. In the SC state, we observed a decrease in the Knight shift, which leads us to suggest a spin-singlet SC state. The possibility of an unconventional SC state is discussed.
- 2013-08-15
著者
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Ihara Yoshihiko
Department Of Physics Graduate School Of Science Kyoto University
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Kawamoto Atsushi
Department of Biology, Faculty of Science, Chiba University
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Kawamoto Atsushi
Department of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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Seki Harumi
Department of Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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