EPR and optical absorption studies on VO ions in KZnClSO4·3H2O single crystals—an observation of superhyperfine structure |
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Authors: | B Deva Prasad Raju |
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Affiliation: | Department of Physics, Sri Venkateswara University, Tirupati 517 502, India |
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Abstract: | EPR spectra of VO2+ ions doped in KZnClSO4·3H2O single crystals have been studied at different temperatures. The EPR spectrum shows a well-resolved hyperfine and superhyperfine structure patterns. The angular variation of EPR spectra reveals the presence of more than three magnetic complexes, which correspond to distinct sites of VO2+ ion. From the angular variation EPR data, the spin-Hamiltonian parameters are evaluated and discussed. The optical absorption spectrum studied at room temperature shows bands corresponding to C4v symmetry. From the EPR and optical data, the molecular-orbital bonding coefficient ε2 and β2 are evaluated and discussed. The observed five-line superhyperfine structure has been attributed to four protons (with I=1/2) from the surrounding water molecules of one of the vanadyl sites. |
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Keywords: | D EPR |
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