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Ferromagnetic and antiferromagnetic ordering in platinum-manganese alloys: low-temperature specific heat
(1974) Saçlı, Ömer Asım; Emerson, D. J.; Brewer, D. F.
Measurements are reported of the specific heat of a number of PtMn alloys. Interaction between the manganese impurities gives rise to antiferromagnetic or ferromagnetic ordering depending on the impurity concentration, the critical concentration for ferromagnetism being 0.8 at % Mn. Using the effect on the specific heat anomaly of the statistical fluctuations in the number of the impurities in a given volume, the interaction range of the impurities is estimated and found to agree with the band structure of platinum.
Rigid band behavior of platinum-vanadium alloys: low-temperature specific heat
(1974) Saçlı, Ömer Asım; Emerson, D. J.; Brewer, D. F.
Measurements are reported of the specific heat of a number of PtV alloys. The results can be analyzed by using a simple rigid band model. The band shape of platinum is deduced and the number of holes in the platinum d band is estimated to be 0.35, which agrees very well with other determinations. Deviations from the simple rigid band behavior were observed for higher vanadium concentrations and are believed to be caused by interactions between impurity atoms. Using the critical concentration of 6 at %V for interactions to start, the interaction range is estimated.