EPR studies on diamagnetic LaNbO 4 and paramagnetic PrNbO 4 crystals doped with the Kramers ions Nd 3+ and Ce 3+ were carried out at X-band (9.61 GHz) in the 4−30 K temperature range. The principal values of Nd 3+ and Ce 3+ g̃ 2 and à 2 tensors, and the orientations of their principal axes, were determined accurately from angular variations of EPR line positions recorded for rotation of the external magnetic field in three mutually perpendicular planes in the two crystals at 8 K. The larger EPR line widths of these ions in the paramagnetic PrNbO 4 host crystal as compared to those in diamagnetic LaNbO 4 are ascribed to their interaction with the host Pr 3+ ions and presence of defects.
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Misra et al. (2004) studied this question.
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