Abstract
The influence of the electron-electron interaction on the upper critical fieldH c2 of thin superconducting films with large resistance and of layered superconductors is investigated theoretically. The orbital effect only is taken into account. It is shown that the electron-electron interaction in the diffusion and Cooper channels influencesH c2 in different manners. The interaction in the diffusion channel (dynamically screened Coulomb interaction) leads to essential deviations from the standard BCS dirty limitH c2 (T) curve at low temperatures and as a result upward curvature inH c2 (T) is possible. The interaction in the Cooper channel is significant only at temperaturesT c−T≪Tc and enlarges the slopedH c2 (T)/dt atT=T c.
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Golubov, A.A., Dorin, V.V. The upper critical field of thin superconducting films with large resistance. J Low Temp Phys 78, 375–386 (1990). https://doi.org/10.1007/BF00683317
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DOI: https://doi.org/10.1007/BF00683317