Abstract
Paramagnetic-resonance measurements under the condition $h\ensuremath{\nu}>\mathrm{kT}$ have been performed on dysprosium in dysprosium ethyl sulfate (DyES) and in yttrium ethyl sulfate. Although crystal-field considerations predict that no resonance is to be expected from Dy ions in the ${C}_{3h}$ symmetry of the ethyl sulfate, a weak absorption has been observed in both salts. The nearest-neighbor interaction in DyES is found to be dipolar. As the temperature is lowered below 1\ifmmode^\circ\else\textdegree\fi{}K, the resonance spectrum exhibits an unusual behavior, splitting up into a complex pattern of overlapping lines. A similar but simpler behavior observed in the dilute salt has been quantitatively explained in terms of a defect model. It is shown that the large $g$-tensor anisotropy of Dy precludes the possibility that the splitting in the concentrated paramagnet is due to magnetostatic modes.
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