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Optical Conductivity Measurement of a Dimer-Mott to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound by Okazaki, Ryuji; Ikemoto, Yuka; Moriwaki, Taro; Shikama, Takahisa; Takahashi, Kazuyuki; Mori, Hatsumi; Nakaya, Hideki; Sasaki, Takahiko; Yasui, Yukio; Terasaki, Ichiro is a scholarly article available to read on EtoBox.

What is Optical Conductivity Measurement of a Dimer-Mott to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound about?

We report a novel insulator-insulator transition arising from the internal charge degrees of freedom in the two-dimensional quarter-filled organic salt beta-(meso-DMBEDT-TTF)2PF6. The optical conductivity spectra above Tc = 70 K display 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 shows up below Tc, indicating a competition between the two insulating phases. Our infrared imaging spectroscopy has further revealed a spatially competitive electronic phases far below Tc, suggesting a nature of quantum phase transition driven by material-parameter variations.

Author

Okazaki, Ryuji; Ikemoto, Yuka; Moriwaki, Taro; Shikama, Takahisa; Takahashi, Kazuyuki; Mori, Hatsumi; Nakaya, Hideki; Sasaki, Takahiko; Yasui, Yukio; Terasaki, Ichiro

Published

2013

Language

EN