Unsuccessful search for time effects in the specific heat of spin-glass Cu-0.88 at.% Mn

The specific heat of a Cu-0.88 at.% Mn alloy measured after rapid heating ({~} 10 s) from 2 K to points in the 7- to 10-K range does not differ significantly ({~} 0.1%) from that measured in the usual way. Neither does that measured after holding many hours at 8 K. The results appear to support a model in which the freezing phenomena are the result of a phase transition rather than nonequilibrium effects. However, differences predicted theoretically by Morgenstern might not have been observed owing to equilibrium time considerations.