Observation of Partial-Disorder-Type Spin Fluctuations in Frustrated Mn^sub 3^Pt

The spin-frustrated intermetallic compound Mn ... Pt exhibits a characteristic magnetic structure called partial disorder, in which some spin sites can form magnetic order through the generation of nonordered sites that locally relieve the frustration. Here, we report the results of a single-crystal inelastic neutron scattering study of this compound. The measured momentum Q correlations of diffusive magnetic scattering reveal that the paramagnetic phase exhibits not completely but strongly two-dimensional spin fluctuations, which are described by short-range interlayer melts with the same type of partial disorder. (ProQuest: ... denotes formulae/symbols omitted.)