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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/063/05/0284-0292

    • Keywords

       

      Electron Spin Resonance; Electron Spin Resonance Spectrum; Orthorhombic Symmetry; Spectrum Versus; Internuclear Axis

    • Abstract

       

      The electron spin resonance spectra of Mn2+ in NaCl single crystals are investigated in detail. Seven different spectra (I, II, III1, III2, IV, V and VI) are observed. The spectra I–IV are the same as those observed by earlier workers, while the spectra V and VI are observed here for the first time. The local symmetry at the paramagnetic ion is orthorhombic for the spectra IV and V and tetragonal for the spectrum VI about the crystallographic [001] direction. The properties of the spectrum IV are explained in terms of an associated pair Mn2+: O22− with O22− molecular ion at the nearest neighbour anion site in the [001] direction with its internuclear axis in the (001) plane. The spectrum V is assigned to the associated pair Mn2+: O22− coupled with a nearby cation vacancy in the [001] direction and the spectrum VI to Mn2+ ion associated with OH ion at the anion site in the [001] direction with a probable second neighbour cation vacancy. All the observed spectra are analysed in terms of the parameters of the usual spin-Hamiltonian.

    • Author Affiliations

       

      K N Shrivastava1 Putcha Venkateswarlu1

      1. Department of Physics, Indian Institute of Technology, Kanpur, India
    • Dates

       
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