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Magnetochemistry 2017, 3(1), 14; doi:10.3390/magnetochemistry3010014

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

1
Department of Materials Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
2
Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Tokyo 152-8552, Japan
3
ACT-C JST, Honcho, Kawaguchi, Saitama 332-0012, Japan
4
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
(This article belongs to the Special Issue Magnetism of Molecular Conductors)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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