Conducting Molecular Magnets Based on TTF-Derivatives |
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Authors: | A Miyazaki K EnomotoK Okabe H YamazakiJ Nishijo T EnokiE Ogura K UgawaY Kuwatani M Iyoda |
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Institution: | a Department of Chemistry, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-;8551, Japanb Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo, 192-0397, Japan |
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Abstract: | The crystal structures, electronic and magnetic properties of conducting molecular magnets developed in our group are reviewed. (DMET)2FeBr4 is composed of alternating stacks of quasi-one-dimensional (1D) donor sheets and square lattice magnetic anion sheets. This salt undergoes an SDW transition of the donor layer at 40 K and an antiferromagnetic transition of Fe3+ spins on the anion layer at 3.7 K. The one-to-one correspondence of the anomalies appearing on the magnetization curves with those on the magnetoresistance supports the presence of the π-d interaction. (EDO-TTFI2)2M(mnt)2] (M=Ni,Pt) consists of 1D chains of conducting donors and magnetic anions aligned in parallel. These salts show metallic conductivity accompanied with a metal-insulator transition around 90 K. Localized spins on the anions behave as a 1D ferromagnet, whose origin is explained by McConnell's first model. The properties of related materials, (EDTDM)2FeBr4, (EDS-TTF)2FeBr4 and (EDO-TTFBr2)2FeBr4, are also presented. |
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Keywords: | molecular conductors molecule-based magnets TTF derivatives π-d interaction |
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