Title: Crystal Structure and Magnetism of (-)<sub>2</sub><sub>4</sub>, (BEDT-TTF = Bis(ethylenedithio)tetrathiafulvalene; = , )
Abstract: Molecules into Materials, pp. 533-540 (2007) No AccessCrystal Structure and Magnetism of (BEDT-TTF)2MCl4, (BEDT-TTF = Bis(ethylenedithio)tetrathiafulvalene; M = Ga, Fe)Mohamedally Kurmoo, Peter Day, Philippe Guionneau, George Bravic, Daniel Chasseau, Laurent Ducasse, Margaret L. Allan, Ian D. Marsden, and Richard H. FriendMohamedally KurmooThe Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K.Laboratoire de Cristallographie et de Physique Cristalline, CNRS, ERS 133, Universite Bordeaux 1, 33405 Talence Cedex, FrancePresent address: Institut de Physique et Chimie des Materiaux de Strasbourg, 23 rue de Loess, F-67037 Strasbourg Cedex, France., Peter DayThe Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, U.K.Present address: Institut de Physique et Chimie des Materiaux de Strasbourg, 23 rue de Loess, F-67037 Strasbourg Cedex, France., Philippe GuionneauLaboratoire de Cristallographie et de Physique Cristalline, CNRS, ERS 133, Universite Bordeaux 1, 33405 Talence Cedex, France, George BravicLaboratoire de Cristallographie et de Physique Cristalline, CNRS, ERS 133, Universite Bordeaux 1, 33405 Talence Cedex, France, Daniel ChasseauLaboratoire de Cristallographie et de Physique Cristalline, CNRS, ERS 133, Universite Bordeaux 1, 33405 Talence Cedex, France, Laurent DucasseLaboratoire de Physico-Chimie Theorique, CNRS, URA 503, Universite Bordeaux 1, 33405 Talence Cedex, France, Margaret L. AllanCavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, U.K., Ian D. MarsdenCavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, U.K., and Richard H. FriendCavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, U.K.https://doi.org/10.1142/9789812706836_0040Cited by:0 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: The relation between crystal structure and bulk magnetic properties is investigated in the molecular charge transfer salts (BEDT-TF)2MCl4 (M = Ga, Fe). (BEDT-TTF)2GaCl4 crystallizes in the triclinic system. Its crystal structure consists of pairs of BEDT-TTF molecules arranged in layers with intermolecular S···S interactions. Band structure calculations predict semimetallic behavior contrary to the semiconductivity observed even under a pressure of 6 kbar (σ(300 K, 1 bar) = 10−1 S cm−1 and EA = 0.2eV). The static (Faraday and SQUID magnetometry) and spin (EPR) susceptibilities indicate low-dimensional Heisenberg antiferromagnetic behavior with the susceptibility tending to zero as the temperature approaches zero. The data are analyzed using several low-dimensional magnetic models and are best fitted to a model consisting of two different spin dimers (Δ1 = 108 K and Δ2 = 212 K). The static magnetic susceptibility of (BEDT-TTF)2FeCl4 is modeled by a sum of Curie–Weiss (S = 5/2 for Fe(d5) and θ = −4 K), χdp, and single dimer (Δ = 45 K) parameters. The BEDT-TTF layers in these compounds thus behave as Mott—Hubbard-localized systems, and the interaction between the magnetic moment on the Fe with those on the organic layer is negligible. FiguresReferencesRelatedDetails Molecules into MaterialsMetrics History PDF download
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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