Abstract
Exact diagonalization technique was applied to a tetranuclear molecular magnet of D4h symmetry with local anisotropic exchange interactions. The spin Hamiltonian of the complex containing four ions with spin s = 1/2 with isotropic ferromagnetic interaction of nearest neighbors was supplemented with local interactions—Dzyaloshinskii–Moria interaction as well as axial and azimuthal exchange anisotropy. The evolution of the energy levels of the complex was investigated as a function of local parameters of the spin Hamiltonian, taking into account the symmetry of the complex. The influence of mixing the wave functions both with the same and different spin states of the levels belonging to different multiplets (spin mixing) was considered. It was shown that strong spin mixing in a cluster of D4h symmetry can only exist due to the local azimuthal anisotropy.
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