Abstract
EPR investigations have been carried out in Mn 2+ doped isomorphous single crystals of MK 2 (SO 4) 2 -6H 2O Tutton salts, where M = Co, Fe, Mg and Zn, at room and at liquid nitrogen temperature using X-band microwave frequency. Mn 2+ has been found to substitute for M 2+ exhibiting two magnetically inequivalent complexes. The EPR spectra have been analyzed using a spin-hamiltonian of orthorhombic symmetry. The additional features observed in the EPR spectra of Mn 2+ in paramagnetic hosts have been attributed to the magnetic interactions between Mn 2+ and the paramagnetic host ions. The use of an impurity probe (e.g. Mn 2+) to measure the extremely fast spin-lattice relaxation times at higher temperatures is illustrated by estimating T 1 of Co 2+ in CoK 2 (SO 4) 2·6H 2O from the observed linewidths of Mn 2+ in CoK 2(SO 4) 2 -6H 2O.
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