Abstract
Electron paramagnetic resonance (EPR) studies have been carried out on VO 2+ ions doped in cobalt maleate tetrahydrate single crystals in the temperature range 103–373 K on X-band frequency. The angular variation EPR studies show three vanadyl complexes with differing intensities. The two intense vanadyl complexes referred as I and II are found to be magnetically inequivalent, whereas the third complex is not followed due to its weaker intensity and overlapping with the other two. The spin-Hamiltonian parameters have been evaluated from single crystal and powder EPR data. The line broadening of VO 2+ spectra on cooling the crystal is explained on the basis of host spin-lattice relaxation narrowing mechanism. From the linewidth of the impurity VO 2+ ions, the spin-lattice relaxation time ( T 1) of Co 2+ ions is estimated at various temperatures. From the temperature dependence of T 1, it is suggested that a two-phonon Raman process may be the main mechanism for spin-lattice relaxation. The optical absorption spectrum shows two bands characteristic of VO 2+ ion. By correlating EPR and optical data, the molecular orbital bonding coefficients have been evaluated and discussed.
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