Fizika Nizkikh Temperatur: Volume 47, Number 11 (November 2021), p. 1053-1060    ( to contents , go back )

Binuclear s = 1/2 single molecular magnets with the symmetry restrictions

A. V. Zhuravlev

Donetsk Institute for Physics and Engineering named after O. O. Galkin, National Academy of Sciences of Ukraine Kyiv 03028, Ukraine
E-mail: alexander.zhuravlev01@gmail.com
cranealex1@gmail.com

pos Анотація:958

Received July 1, 2021, published online September 24, 2021

Abstract

Exchange anisotropy effects in equal-spin s(1) = s(2) dimeric single-molecule magnets exhibiting C2 point-group symmetry have been studied. The Hamiltonian, which is written in two-spin 4×4 Pauli matrixes representation in the appropriate noncollinear local coordinates systems, has been transformed to common coordinates and used to derive energy levels and spin eigenstates. An anomalous variation of the magnetic system average spin depending on the misalignment of the local anisotropy axes has been found. Particularly, a fully nonmagnetic state of an s = 1/2 spin dimer and “silent” EPR mode has been predicted. The angular boundaries of the EPR existence have been determined for any possible mutual deflections of the local ion axes for each of the 6 possible transitions between the levels of the spin system, both in zero and in a nonzero magnetic field.

Key words: molecular magnetism, exchange interactions (electron), magnetic anisotropy, spin crossover, EPR spectroscopy.

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