Abstract
Transverse and longitudinal muon spin-relaxation experiments have been carried out in the ferromagnetic and paramagnetic states of a Pd--2.0 at. % Mn alloy to determine effects of spin-configuration disorder on the distribution of local (dipolar) fields at positive muon (..mu../sup +/) sites, and on dynamic-relaxation processes. The giant-moment polarization cloud appears to make no contribution to the local-field distribution in the paramagnetic state (T>T/sub c/ = 5.8 K). The Walstedt-Walker formula for the ..mu../sup +/ linewidth is in good agreement with the data. In the ferromagnetic phase the distribution width is less than predicted by a mean-field model of a uniform spin system. This ''shortfall'' is accounted for qualitatively by the Sherrington-Kirkpatrick (replica-symmetric) theory for disordered ferromagnets. Spin-lattice relaxation rates in zero applied field give clear evidence for critical slowing down of Mn spin fluctuations over a wide range of temperatures. Muon-relaxation rates well below T/sub c/ are consistent with a two-magnon (Raman) scattering mechanism.
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