Inhomogeneous electronic state of organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]I studied by C13 NMR spectroscopy
Inhomogeneous electronic state of organic conductor κ-(BEDT-TTF)2Cu[N(CN)2]I studied by C13 NMR spectroscopy
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C13 NMR谱研究有机导体κ-(BEDT-TTF)2Cu[N(CN)2]I的非均匀电子态
DOI：
10.1103/physrevb.100.195115
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发表时间：
2019
影响因子：
3.7
通讯作者：
and A. Kawamoto
中科院分区：
文献类型：
--
作者：
T. Kobayashi;A. Suzuta;K. Tsuji;Y. Ihara;and A. Kawamoto
有机导体的物理性质不符合等结构-Br和-Cl的通用相图。为了系统地了解型盐，我们测量和比较了-I，-Br和-Cl的NMR谱。的-I光谱表现出突然线加宽低于40 K由于电子的不均匀性和增加的自旋-晶格弛豫速率除以温度下降到最低温度，这表明增强的反铁磁（AF）波动的发展。这些结果表明，不具有长程有序的AF涨落是由电子不均匀性引起的，它干扰了相干性的发展。因此，-I是在低温下具有AF波动的绝缘体，类似于X射线辐照的-Cl。我们认为，不仅压力，而且无序是一个关键参数的物理性质的类型的盐。
The physical properties of the organic conductorare inconsistent with the universal phase diagram of isostructural-Br and-Cl. To systematically understand-type salts, we measured and comparedNMR spectra of-I,-Br, and-Cl. The-I spectra manifested abrupt line broadening below 40 K due to the development of electronic inhomogeneity and an increase in the spin-lattice relaxation rate divided by temperaturedown to the lowest temperature, suggesting an enhanced antiferromagnetic (AF) fluctuation. These results imply that AF fluctuation without long-range order in-I is induced by electronic inhomogeneity, which disturbs the development of coherency. Consequently,-I is an insulator with AF fluctuation at low temperature similar to x-ray-irradiated-Cl. We suggest that not only pressure but also disorder is a key parameter in the physical properties of-type salts.