Heat Capacity of Ordered and Disordered CuPt Below 4.2°K

Heat-capacity measurements below 4.2^∘{}K on CuPt show that the electronic heat-capacity coefficient γ decreases from 0.825 mJ mole^-1 deg^-2 in the disordered condition to 0.530 in the ordered condition. The Debye temperature increases on ordering from 357 to 385^∘{}K. It is suggested that the observed changes can be explained either in terms of the alterations in the Brillouin zone structure which occur on ordering or by the possibility of a magnetic transition in the ordered condition.