Abstract
The resistive transition of superconducting Nb films evaporated onto a liquid-He-cooled substrate has been investigated, and shows a rounding characteristic of the thermal fluctuations. Transition curves have been measured above and below the superconducting transition temperatureT c in the absence of a magnetic field. The excess electrical conductivity due to fluctuations aboveT c of quench-condensed Nb films is well described in terms of the sum of the contributions from the Aslamazov-Larkin term and from the Maki-Thompson term, in contradistinction to the case of quench-condensed Bi, Ga, and Pb films. This suggests that thermal phonons play an important role in the contribution of the Maki term.
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Kawaguti, T., Shibuya, Y. Excess electrical conductivity due to fluctuations of quench-condensed superconducting Nb films. J Low Temp Phys 17, 143–157 (1974). https://doi.org/10.1007/BF00654550
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DOI: https://doi.org/10.1007/BF00654550