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
Received: 13 January 2017 / Revised: 20 February 2017 / Accepted: 22 February 2017 / Published: 1 March 2017
Structural, transport, and magnetic properties of new organic conductors composed of (BEDT-TTF)
, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene, have been investigated. Two
-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
P, As, Sb, and Ta) increases continuously with increasing the anion volume.
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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.
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(1):14.
Kawamoto, Tadashi; Kurata, Kohei; Mori, Takehiko; Kumai, Reiji. 2017. "Charge Ordering Transitions of the New Organic Conductors δm- and δo-(BEDT-TTF)2TaF6." Magnetochemistry 3, no. 1: 14.
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