Pressure effect on Charge-Density-Wave in Per₂M(mnt)₂ (M=Pt, Au)

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• 作者：Naofumi Mitsu ; Kazuhiko Yamaya ; Manuel Almeida and Rui T. Henriques
• 关键词：A. Organometallic compounds ; C. High pressure ; D. Charge density waves ; D. Phase transitions ; D. Electrical properties
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2005
• 期刊代码：69_00223697
• 类别：ch
• 出版时间：2005
• 卷：66
• 期：8-9
• 页码：1567-1570
• 文件大小：1364 K

摘要

The Charge-Density-Wave (CDW) transition temperature T_CDW of quasione-dimensional conductors Per₂M(mnt)₂ (M=Au, Pt) steeply decreases with increasing pressure up to 0.5 GPa but the pressure-induced transition to a metallic state is not observed at least up to 1.5 GPa. At ambient pressure the resistance decreases with decreasing temperature but turns to increase at the temperature T_min corresponding to the resistance minimum, and then it exponentially raises below T_CDW. T_min initially decreases steeply with increasing pressure but becomes nearly constant at pressures above 0.5 GPa, where T_CDW disappears. Nonlinear conduction is observed under pressures above 1 GPa and at temperatures below 4.2 K. The present results are discussed in terms of the pressure-induced quantum melting of the CDW state.