LOW TEMPERATURE SPECIFIC HEAT OF SN AND SN-IN ALLOYS.
ILLINOIS UNIV URBANA DEPT OF PHYSICS
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The normal state specific heats of pure tin and alloys consisting of 0.5, 1, 2, 4, and 6 atomic percent indium in tin have been measured between about 0.4 and 4.2 K. All of the alloys lie within the solid solubility limit of indium in tin. Measurements were made in an adiabatic calorimeter cooled by a He3 refrigerator, with the specimens magnetically quenched from the superconducting state. Additional cooling of some specimens was possible by adiabatic magnetization to achieve temperatures as low as 0.24 K. The results for pure tin are compared with recent data for the temperature coefficient of the normal electronic specific heat, gamma, and the Debye temperature, theta. The results for the alloys are interpreted in terms of the variation in gamma and theta, and comparisons are made with recent determinations of the variations of gamma and theta with increasing indium concentration. While the variation of theta is in reasonable agreement with reported values, the variation of gamma with increasing indium content is positive, in disagreement with previously reported data. The results are also discussed in the light of the theories of Markowitz and Kadanoff and of Ginsberg on the variation of the critical temperatures of superconductors with alloying.
- Solid State Physics