Abstract
Abstract The EPR strain parameters of cubic Gd 3+ in CaF2 have been measured using the ultrasonic strain modulation technique (UMER) in which 40 kHz strain modulation replaces the magnetic field modulation in conventional EPR. The results are consistent with, but more extensive than, those obtained by static stress measurements of the shift in the resonant field. An analysis of the results shows that the nearest-neighbor superposition model is unable to account for the low value of the fourth-order shear spin-lattice relaxation coefficient Gs.), but for the dilatation and tetragonal spin-lattice relaxation coefficients, the model works satisfactorily.
Published Version
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