Abstract
We have performed X-ray diffraction study under pressure for isostructural anion radical salts g '-Et 2 Me 2 Z[Pd(dmit) 2 ] 2 (Z = P, As, Sb) at room temperature. The unit cells remained monoclinic and no satellite reflection was detected up to 18 kbar. For the high-pressure superconductor Et 2 Me 2 P salt, high-pressure crystal structure analyses were carried out. Obtained band parameters indicate an increase of bandwidth and a decrease of the dimensionality of a HOMO-based band. This is related to a pressure-induced metallic state and a non-metallic state in the higher pressure region. molecular conductor metal dithiolene complex crystal structure pressure effect
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