Heat Capacity of Ordered and Disordered CuPt Below 4.2°K

Abstract

Heat-capacity measurements below 4.2°K on CuPt show that the electronic heat-capacity coefficient $\gamma$ decreases from 0.825 mJ ${\mathrm{mole}}^{-1\mathrm{}}$ ${\mathrm{deg}}^{-2\mathrm{}}$ 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.