Ultrasonic Evidence Against Multiple Energy Gaps in Superconducting Niobium
- 18 September 1972
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 29 (12), 764-767
- https://doi.org/10.1103/physrevlett.29.764
Abstract
The attenuation of longitudinal ultrasound along the [100] direction in Nb, resistivity ratio , has been measured with precision at low temperatures. The total attenuation in the normal state can be accurately deduced by a BCS calculation, with a single gap , from the measured superconducting attenuation. No experimental evidence has been found for the existence of either a smaller or a larger gap.
Keywords
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