Anomalous heat capacities of niobium and tantalum below 1 K
- 1 October 1974
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 10 (7), 2771-2776
- https://doi.org/10.1103/physrevb.10.2771
Abstract
The specific heat of superconducting Nb has been measured in the temperature range 0.06-2 K in an outgassed condition (initial H and D concentrations ≲ 1 ppm atomic) and with H or D added as interstitial solutes. The specific heat of superconducting and normal Ta has also been measured in the outgassed condition and with H intentionally added. The addition of H or D to these bcc transition metals produces an isotope-dependent specific-heat anomaly which appears to be related to a displacive motion of the interstitial H or D. No evidence is found in either metal which would be suggestive of a second superconducting energy gap.Keywords
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