Some comments on the theory of spin glasses

Abstract

To explain the occurrence of the sharp cusp of the low-field susceptibility chi of spin glasses, some theories have been put forward which lead to a special type of phase transition at a critical temperature T₀. It is shown that the straightforward application of such theories to deduce the magnetic part c_m of the specific heat leads to some anomaly of this quantity at T₀. More accurate measurements of c_m and chi near T₀ are necessary. At the moment it looks like a contradiction between theory and experiment.