期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 75, 期 8, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.75.083710
关键词
(MeDH-TTP)(2)AsF6; reduced pi-donor system; strong correlation; metal-insulator transition; quantum critical point; high-pressure
The temperature-pressure (T-P) phase diagram of the reduced pi-donor system (MeDH-TTP)(2)AsF6 is studied using resistivity measurement, where MeDH-TTP stands for 2-methyl-5-(1,3-dithiolan-2-yliden)-1,3,4,6-tetrathiapentalene. The insulating phase is suppressed completely beyond P-c = 2.4 GPa. Above P-c, we find two distinct metallic states that are regarded as the Fermi liquid (FL) state at lower temperatures and the bad metal at higher temperatures. Around P-c, remarkable enhancements in the residual resistivity rho(0) as well as in the T-2-term coefficient A associated with FL behavior are found. We discuss the origin of the insulating phase and the possible quantum critical point at P-c in (MeDH-TTP)(2)AsF6.
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