Localization of conduction electrons and the magnetic properties of the molecular metals {beta}''-(BEDT-TTF){sub 4}NH{sub 4}[M(C{sub 2}O{sub 4}){sub 3}] . DMF (M = Cr{sup 3+}, Fe{sup 3+})
- Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)
- Russian Academy of Sciences, Institute of Problems in Chemical Physics (Russian Federation)
- Institute for Molecular Science (Japan)
Quasi-two-dimensional organic metals {beta}''-(BEDT-TTF){sub 4}NH{sub 4}[M(C{sub 2}O{sub 4}){sub 3}] . DMF containing the oxalate complexes of Cr{sup 3+} or Fe{sup 3+} ions between the conducting organic layers of the BEDT-TTF molecules are studied by EPR spectroscopy, and the contributions of these metallic complexes, conduction electrons, and non-equilibrium lattice defects to the magnetic susceptibility are determined. An analysis of the temperature dependence of the magnetic susceptibility and the EPR line shape has revealed partial localization of conduction electrons at T < 20 K in the crystals with Cr{sup 3+} ions. The size of the localization region is close to the size of an individual BEDT-TTF molecule. The localization effect weakens as nonequilibrium defects disappear during long-term storage at room temperature. The localization of conduction electrons is found to be accompanied by the appearance of weak antiferromagnetic interaction between the Cr{sup 3+} ions at T < 20 K, which disappears when Fe{sup 3+} ions substitute for Cr{sup 3+} ions.
- OSTI ID:
- 21067755
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 102, Issue 1; Other Information: DOI: 10.1134/S1063776106010146; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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