Electron paramagnetic resonance and optical absorption studies on Mn2+ ions doped in KZnClSO4·3H2O single crystals

Electron paramagnetic resonance (EPR) studies have been carried out on Mn2+ ions doped in potassium zinc chloro sulphate trihydrate (KZnClSO4·3H2O) single crystals in the temperature range 103-343 K on X-band frequency. The EPR spectrum at room temperature exhibits a group of five fine structure transitions each splits into six hyperfine components. The angular variation of EPR spectra reveals the presence of more than one magnetic complex, which correspond to distinct sites of Mn2+ ions. From the observed EPR spectrum, the spin-Hamiltonian parameters have been evaluated. The variation of zero-field splitting parameter (D) with temperature is measured and discussed. The optical absorption spectrum exhibits five bands characteristic of Mn2+ ions in an octahedral symmetry. From the observed band positions, the crystal field splitting parameter Dq and the Racah interelectronic repulsion parameters B and C have been evaluated.