Superconducting Properties of Tin, Indium, and Mercury below 1° K
- 18 October 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 140 (2A), A507-A518
- https://doi.org/10.1103/PhysRev.140.A507
Abstract
The superconducting critical field curves for pure Sn, In, and Hg have been measured down to about 0.3°K. In the low-temperature region where the superconducting electronic entropy is negligible, the entropy difference (and hence the normal electronic entropy) is linear in temperature, as expected for a free electron gas. The measurements provide a sensitive test for details of the BCS theory in that the accuracy obtainable is much higher than in other experiments. A simple scaling of the energy-gap-to-temperature ratio brings the theoretical predictions into good agreement with experiment. The results are critically analyzed in the light of a possible lattice contribution to the entropy change at the superconducting transition of In, but no evidence for such a lattice contribution is found.Keywords
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