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Temperature Dependence of the EPR Spectra of Cr 3+ and Cr 5+ Ions in CaV 2 O 6 and BaV 2 O 6 Crystals
Author(s) -
Grunin V. S.,
Patrina I. B.,
Zonn Z. N.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220980242
Subject(s) - electron paramagnetic resonance , ion , impurity , paramagnetism , chromium , spectral line , symmetry (geometry) , chemistry , jahn–teller effect , crystallography , materials science , nuclear magnetic resonance , condensed matter physics , physics , geometry , mathematics , organic chemistry , astronomy
An investigation is made of EPR spectra of CaV 2 O 6 and BaV 2 O 6 single crystals doped with chromium. It is found that the point symmetry of the paramagnetic Cr 3+ and Cr 5+ ions depends on temperature. It follows from the symmetry of the Cr 5+ spectrum in BaV 2 O 6 and its superhyperfine structure at T = 77 K that the Cr 5+ ion is displaced to one of two neighbouring V atoms. The observed change of the impurity ion symmetry cannot be explained both by the off‐centre ion theory and the Jahn‐Teller effect.