Abstract

(TTM-TTP)(I 3) 5/3 (TTM-TTP: 2,5-bis[4,5-(methylthio)-1,3-dithiol-2-ylidene]-1,3,4,6-tetrathiapentalene) and its isostructual methylseleno-substituted compounds show metallic behavior above t mi ≈ 20 K in spite of large positive charge +5/3. High pressure resistivity and ESR measurements have been carried out. Both salts remain paramagnetic down to 2.9 K; no evidence of spin-Peierls or antiferromagnetic transition is obtained.

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