2002 年 71 巻 3 号 p. 732-734
For an organic π-d metal λ-(BEDT-TSF)2FeCl4, where BEDT-TSF is an abbreviation of bis(ethylenedithio)tetraselenafulvalene, we have measured 1H-NMR to clarify the quite anomalous ferroelectric-like metallic states below TFM = 70 K recently found in the microwave conductivity and specific heat measurements as well as the metal-to-insulator transition at TMI = 8.3 K associated with antiferromagnetic ordering. Just at the temperature TFM, the second-order ferroelectric-like phase transition temperature, a single peak at higher temperatures of 100 K and 80 K starts to split into three asymmetric peaks, which are analyzed by Gaussian deconvolution with three components. It is considered that this anomalous splitting of the NMR spectra is attributed to the hyperfine field between the proton nucleus and π electrons. This anomaly at TFM is discussed in terms of a charge disproportionation.
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