Optical Conductivity Measurement of a Dimer-Mott to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound
Optical Conductivity Measurement of a Dimer-Mott to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound
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二维四分之一填充有机盐化合物中二聚体莫特到电荷有序相变的光导率测量
DOI：
10.1103/physrevlett.111.217801
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
and I.Terasaki
中科院分区：
文献类型：
--
作者：
R.Okazaki;Y.Ikemoto;T.Moriwaki;T.Shikama;K.Takahashi;H.Mori;H.Nakaya;T.Sasaki;Y.Yasui;and I.Terasaki
我们报道了一种新的绝缘体-绝缘体转变，这种转变源于二维四分之一填充有机盐的内部电荷自由度。上述光电导谱显示了二聚体Mott绝缘体的一个显著特征，其特征是随着温度的降低，在0.6 eV附近的二聚体峰显著增大。一旦电荷顺序的峰值出现在下面，二聚体峰的增长就会迅速熄灭，这表明两个绝缘相之间存在竞争。我们的红外成像光谱学进一步揭示了下面一个空间竞争的电子相，表明了由材料参数变化驱动的量子相变的性质。
We report a novel insulator-insulator transition arising from the internal charge degrees of freedom in the two-dimensional quarter-filled organic salt. The optical conductivity spectra abovedisplay a prominent feature of the dimer Mott insulator, characterized by a substantial growth of a dimer peak near 0.6 eV with decreasing temperature. The dimer peak growth is rapidly quenched as soon as a peak of the charge order appears below, indicating a competition between the two insulating phases. Our infrared imaging spectroscopy has further revealed a spatially competitive electronic phase far below, suggesting a nature of quantum phase transition driven by material-parameter variations.