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Pseudocubic Angular Dependence of the M = − 1/2 to + 1/2 EPR Transitions for Ions with S = 3/2 Produced by Small Crystal Fields of Arbitrary Symmetry and Random Strains
Author(s) -
Gehlhoff W.
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.2221010232
Subject(s) - physics , ion , lattice (music) , condensed matter physics , symmetry (geometry) , magnetic field , electron paramagnetic resonance , square lattice , quantum mechanics , geometry , mathematics , acoustics , ising model
Previous investigations of the angular dependence of the −1/2 ⟷ +1/2 transition which turned out to be pseudocubic in spite of lower centre symmetry are extended to the case of arbitrary symmetry. Moreover the influence of random strains is calculated. The result is that also in both these cases the centre of gravity of the line groups exhibits a cubic angular dependence. Thus in the case of unresolved structures and non‐detectable ± 1/2 ⟷ ± 3/2 transitions the exact symmetry of the centre cannot be directly deduced from the angular dependence. The contributions from the local lattice distortions to the cubic angular dependence vary essentially inversely with the square of the magnetic field and can be determined by measuring at different microwave frequencies.