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Abstract:
The specific heat was measured in a highly homogenized sample of (La0.9936Ce0.0064) Al2 between 0.35 and 1.5 K, both in the superconducting and in the normal state. The difference of the specific heats ΔC = CS − CN was observed to change its sign twice. Hence the existence of an ‘intermediate temperature superconductor’ is suggested by means of a true volume effect. Reasonable agreement is found between the conclusions from the specific heat experiment and recent results of Winzer obtained for the upper critical magnetic field.
