Magnetic behavior of a spin-1 dimer: model system for homodinuclear nickel (II) complexes

TL;DR

This paper investigates the magnetic properties of a spin-1 Heisenberg dimer, providing exact analytical solutions and comparing theoretical results with experimental data on a specific nickel(II) complex.

Contribution

It offers a complete analytical solution for the magnetic behavior of a spin-1 dimer considering anisotropies and magnetic fields, linking theory with experimental data.

Findings

Analytical expressions for Gibbs free energy and susceptibilities.

Agreement between theoretical predictions and experimental data.

Insights into anisotropy effects on magnetic behavior.

Abstract

Magnetic behavior of a spin-1 Heisenberg dimer is analysed in dependence on both uniaxial single-ion anisotropy and XXZ exchange anisotropy in a zero- as well as non-zero longitudinal magnetic field. A complete set of eigenfunctions and eigenvalues of the total Hamiltonian is presented together with an exact analytical expression for the Gibbs free energy, longitudinal magnetization, longitudinal and transverse susceptibility. The obtained theoretical results are compared with the relevant experimental data of [Ni2(Medpt)2(ox)(H2O)2](ClO4)2.2H2O (Medpt = methyl-bis(3-aminopropyl)amine).