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Charge Ordering Transitions of the New Organic Conductors δm- and δo-(BEDT-TTF)2TaF6

Department of Materials Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Tokyo 152-8552, Japan
ACT-C JST, Honcho, Kawaguchi, Saitama 332-0012, Japan
Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
Author to whom correspondence should be addressed.
Academic Editor: Manuel Almeida
Magnetochemistry 2017, 3(1), 14;
Received: 13 January 2017 / Revised: 20 February 2017 / Accepted: 22 February 2017 / Published: 1 March 2017
(This article belongs to the Special Issue Magnetism of Molecular Conductors)
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Structural, transport, and magnetic properties of new organic conductors composed of (BEDT-TTF) 2 TaF 6 , where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene, have been investigated. Two δ -type polymorphs, monoclinic and orthorhombic phases are obtained by the electrocrystallization. Both phases show a semiconductor-insulator phase transition at 276 K and 300 K for the monoclinic and orthorhombic phases, respectively; the ground state of both salts is a nonmagnetic insulating state. The low-temperature X-ray diffraction measurements show two-fold superlattice reflections in the intercolumnar direction. The low-temperature crystal structures show a clear charge ordered state, which is demonstrated by the molecular shape and intramolecular bond lengths. The observed checkerboard charge ordered state is in agreement with the charge ordering in a dimer Mott insulator. If we distinguish between the monoclinic and orthorhombic phases, the transition temperature of the δ -type (BEDT-TTF) 2 M F 6 conductors ( M = P, As, Sb, and Ta) increases continuously with increasing the anion volume. View Full-Text
Keywords: molecular conductor; electronic correlation; charge order molecular conductor; electronic correlation; charge order

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Kawamoto, T.; Kurata, K.; Mori, T.; Kumai, R. Charge Ordering Transitions of the New Organic Conductors δm- and δo-(BEDT-TTF)2TaF6. Magnetochemistry 2017, 3, 14.

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