Abstract
The EPR linewidth in the paramagnetic phase ($T>{T}_{g}$) of $\mathrm{Ag}{\mathrm{Mn}}_{x}$ and $\mathrm{Ag}{\mathrm{Mn}}_{x}{\mathrm{Sb}}_{y}$ contains a term which increases near ${T}_{g}$ as a power law in $\frac{(T\ensuremath{-}{T}_{g})}{{T}_{g}}$. The magnitude of the power-law contribution varies linearly with $y$. These results are interpreted in terms of exchange narrowing of an anisotropic, Dyaloshinski-Moriya interaction. Both width and shift depend strongly on frequency between 1 and 9.6 GHz. The shift behaves neither as a pure $g$-value shift nor as a frequency-independent internal field. Results are compared with the microscopic theory of Levy, Morgan-Pond, and Raghavan, and with a phenomenological approach.
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