Collapse of charge order in a quasi-one-dimensional organic conductor with a quarter-filled band.
A charge-ordered insulator, (DI-DCNQI)2Ag, with a quasi-one-dimensional quarter-filled band is metallized by pressure. It was found that the charge order melts into a curious metallic state with cubic-temperature dependence of the resistivity, which implies the unprecedented mechanism of the electron-electron scattering. We constructed the pressure-temperature phase diagram, where the melting line has a tricritical point dividing the second-order line at low pressures and the first-order line at high pressures just before it vanishes.
Itou
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Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
Kanoda
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Murata
K
K
Matsumoto
T
T
Hiraki
K
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Takahashi
T
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