Uniaxial Strain Effect on the θ-Phase Organic Conductor with a Large Dihedral Angle, θ-(TMET-TTP)4PF6

Tomoaki Takeuchi; Hirotada Hoshino; Ryusuke Kondo; Seiichi Kagoshima; Masaya Enomoto; Tadashi Kawamoto; Takehiko Mori

doi:10.1143/jpsj.72.1152

Uniaxial Strain Effect on the θ-Phase Organic Conductor with a Large Dihedral Angle, θ-(TMET-TTP)₄PF₆

Tomoaki Takeuchi, Hirotada Hoshino, Ryusuke Kondo, Seiichi Kagoshima, Masaya Enomoto, Tadashi Kawamoto, Takehiko Mori

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Keywords: organic conductor, universal phase diagram, uniaxial strain, dihedral angle

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2003 Volume 72 Issue 5 Pages 1152-1154

DOI https://doi.org/10.1143/jpsj.72.1152

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Abstract

For the organic conductor θ-(TMET-TTP)₄PF₆ (TMET-TTP: 2-[4,5-bis(methylthio)-1,3-dithiol-2-ylidene]-5-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene), electrical resistance has been measured under the uniaxial strain applied along the a-, b-, and c-axes as well as under hydrostatic pressure. Contrary to the prediction of the universal phase diagram in which the c-axis strain will raise the metal–insulator transition temperature by expanding the dihedral angle, the insulating state is suppressed under the strain in all directions. The results are interpreted in terms of the increasing intra-stack transfer integral in the large dihedral angle region.

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