Abstract
The reversible susceptibility and the thermo‐remanent (TRM) and isothermal remanent magnetization (IRM) of three PtMn alloys (0.5; 1.0; 2.5 at.%) have been measured in the temperature range from 0.05 to 4.2 K. The reversible susceptibility shows pronounced peaks at the spin glass freezing temperature TMαc for the two most dilute alloys. The peaks are connected to the appearance of a remanent magnetization below TM, as e.g. in the AuFe system. With increasing impurity concentration a tendency towards antiferromagnetism is observed. The spin value for Mn in Pt, as taken from a Curie‐Weiss law is slightly decreasing from S=2.5 to S=2.2 as the concentration increases. A comparison in terms of scaling law (specific heat, susceptibility, freezing temperature) shows that in PtMn the interactions between the impurity atoms are much weaker than in other spin glass systems, e.g. CuMn.
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