The influence of the atomic order-disorder transformation on the transport properties of PtCr

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Abstract
The authors have measured the electrical resistivity rho (T) of spatially ordered and disordered PtCr alloys containing between 18 and 21 at.% Cr, from 1.4 to 300K. The electrical properties correlate with the magnetic properties as rho (T) in the spatially ordered alloys contains a component which increases with increasing temperature in a manner consistent with spin-disorder scattering from excitations out of a magnetically ordered ground state. The spatially disordered alloys exhibit spin-glass-like features with rho (T) passing through a gentle inflection point at temperatures above that of the susceptibility maximum (T0). However the low-temperature behaviour of the spatially disordered alloys is anomalous in that no maximum appears in the incremental resistivity. Various causes for the lack of such an anomaly are discussed tentatively.