Abstract
(TSM-TTP)(I 3) 5/3 (TSM-TTP: 2,5-bis[4,5-bis(methylseleno)-1,3-dithiol-2-ylidene]-1,3,4,6-tetrathiapentalene) is a one-dimensional organic conductor which undergoes a metal–insulator transition at T MI≈20 K. High pressure resistivity, ESR, and static magnetic susceptibility measurements have been carried out to clarify the origin of the metal–insulator transition. The metal–insulator transition temperature is not completely suppressed even under a pressure of 11.8 kbar. The ESR line shape shows no anomaly and the magnetic susceptibility shows a slight increase below 70 K, and remains paramagnetic down to 1.75 K; no evidence of spin-Peierls or antiferromagnetic transition is obtained.
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