Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 4, Pages 976-982Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.976
Keywords
dmit compounds; crystal structure under high-pressure; dimer structure; band structure; Mott transition; triangular lattice
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The two-dimensional molecular conductor beta'-Et2Me2P[Pd(dmi)(2)](2) is a Mott insulator under ambient pressure and exhibits a metallic state accompanied by the superconductivity with applying pressure. And, in the higher pressure region, another non-metallic behavior appears. X-ray single-crystal structure analyses under high pressures were performed at room and low temperatures to reveal the mechanism of the pressure effect. Tight-binding band calculations based on the resultant structural data indicate that the insulator-to-metal transition is a Mott transition due to an increase of the band width of the HOMO-based band and the HOMO-LUMO band overlap mechanism proposed in the previous report does not apply to this case. The high-pressure non-metallic state is relevant to the structural transition with a symmetry breaking.
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