Electron spin resonance studies on Cu2+ doped at tetrahedrally coordinated Zn2+ sites in the single crystals of guanadinium zinc sulfate

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Abstract
Electron spin resonance studies have been made on Cu2+ doped single crystals of guanadinium zinc sulfate and incorporated at tetrahedrally coordinated Zn2+ sites at 295 °K. The spectra could be fitted to an axial spin Hamiltonian and spectral parameters characterize large g∥ value and unusually small hyperfine splitting for the paramagnetic ion. The metal–ligand bonding is predominantly ionic and the 3d–4p mixing is an important feature in explaining the small hyperfine coupling constant.

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