Abstract
Quasi-two-dimensional organic metals β″-(BEDT-TTF)4NH4[M(C2O4)3] · DMF containing the oxalate complexes of Cr3+ or Fe3+ 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 Cr3+ 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 Cr3+ ions at T < 20 K, which disappears when Fe3+ ions substitute for Cr3+ ions.
Published Version
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