Electron paramagnetic resonance of Cu2+ doped Na2HAsO4 center dot 7H2O single crystals

Abstract

The electron paramagnetic resonance spectra of Cu2+ doped Na2HAsO4. 7H(2)O single crystals were studied at room temperature. The results indicate the substitutional entrance of Cu2+ in two magnetically inequivalent Na sites. Charge compensation is supposed to be fulfilled by proton vacancies. The spin Hamiltonian parameters were determined. The ground state for Cu2+ seems to indicate the dominance of the d(z)2 orbital and therefore a compression of the distorted octahedron along its C-4v axis.