Abstract
The EPR spectra of a quasi-two-dimensional organic metal [Pd(dddt)2]Ag1.5Br3.5 contain signals due to the spin resonance of conduction electrons (CESR) and signals due to the localized magnetic moments of Ag2+. The system of Ag2+ ions exhibits a strong indirect antiferromagnetic exchange interaction characterized by the Weiss constant Θ=−280(25) K, which leads to magnetic ordering at a temperature of T0=70(10) K. The same temperature T0 corresponds to a strong anomaly in the CESR linewidth. The observed anomaly in the CESR linewidth, as well as some features of the temperature dependence of conductivity in the system studied, are explained by the interaction between conduction electrons and Ag2+ ions localized in the anion layers (π-d interaction) and by antiferromagnetic ordering of the spins of Ag2+ magnetic ions.
Published Version
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