EPR, optical absorption and superposition model studies of Cr3+

  • Ram Kripal Professor of Physics, Department of Physics University of Allahabad, Allahabad, India
  • Awadhesh Kumar Yadav Professor at Department of Physics, University of Allahabad, Allahabad, India
Keywords: A. Inorganic compounds, B. Crystal Growth, D. Crystal Fields, D. Electron Paramagnetic Resonance, D. Optical Properties.

Abstract

Electron paramagnetic resonance (EPR) study of Cr3+ doped cesium tetrabromozincate (CTBZ) single crystal is done at room temperature. The hyperfine structure for Cr53 isotope is also obtained. Two magnetically inequivalent sites for Cr3+ are observed. The spin Hamiltonian parameters are evaluated as: D = 234×10-4cm-1, E = 69×10-4cm-1, g = 2.0104, A = 80×10-4 cm-1 for site I and D = 235×10-4 cm-1, E = 70×10-4cm-1, g = 2.0061, A = 82×10-4cm-1 for site II, respectively. The optical absorption spectra are recorded at room temperature. The energy values of different orbital levels are determined. The values of various parameters obtained are: B = 602 cm-1, C = 2504 cm-1, Dq = 1870 cm-1, h = 1.63 and k = 0.21, where B and C are Racah parameters, Dq is crystal field parameter, and h and k are nephelauxetic parameters, respectively. Theoretical zero-field splitting (ZFS) parameters for Cr3+ at two sites in CTBZ are evaluated using superposition model and microscopic spin Hamiltonian theory. The theoretical ZFS parameters are in good agreement with the experimental values.

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Published
2015-10-12
How to Cite
Kripal, R., & Yadav, A. (2015). EPR, optical absorption and superposition model studies of Cr3+. Boson Journal of Modern Physics, 1(1), 26-38. Retrieved from http://www.scitecresearch.com/journals/index.php/bjmp/article/view/308
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