The phase diagram of nonequilibrium, splat-cooled ${\mathrm{Cu}}_x{\mathrm{La}}_{1-x}$ is interpreted by means of superconductive-transition and x-ray measurements. At the eutectic composition the material is shown to be in a highly disordered state. Measurements of dc resistance and ac susceptibility show that there are two different critical fields at the disordered concentration although there is a unique critical temperature.

• Received 23 August 1979

DOI:https://doi.org/10.1103/PhysRevB.21.2804