Abstract
Measurements of the temperature dependence and magnetic-field dependence of the paraconductivity of a three-dimensional amorphous superconductor are presented. The data are analyzed in terms of several current theories and are found to give good agreement for low fields and temperatures near . Strong pair-breaking effects due to thermal phonons are believed to account for the observed absence of anomalous Maki-Thompson contributions to the paraconductivity. The paraconductivity falls well below predicted theoretical values in the high-temperature and high-field limits. This is attributed to the reduced role of high-wave-vector contributions to the paraconductivity. It is shown that the introduction of a short-wavelength cutoff in the theoretical fluctuation spectrum provides a phenomenological account of the discrepancy between theory and experiment.
- Received 19 September 1977
DOI:https://doi.org/10.1103/PhysRevB.17.2884
©1978 American Physical Society