Low-temperature EPR spectrum of a CENI cluster magnet

Abstract

The energy spectrum and resonance transitions in the EPR spectrum for a four-site cluster with an exchange interaction between nearest neighbors and diagonal coupling are calculated. The cases of isotropic and anisotropic exchange couplings are analyzed. The Dzyaloshinskii–Moriya interaction is taken into account in the second case. Using the computational results, it is possible to describe the shape of the EPR absorption band of a powdered sample of the metal organic compound CENI, which undergoes appreciable changes with a change in temperature. It is shown that these changes occur because of the appearance of additional interlevel resonance transitions, whose intensity increases as temperature decreases.