Fermi-liquid effects in the gapless state of marginally thin superconducting films

Details Fermi-liquid effects in the gapless state of marginally thin superconducting films Fermi-liquid effects in the gapless state of marginally thin superconducting films

2008-09-24

arxiv.org/abs/0809.4077v1

Phys. Rev. B 78, 104515 (2008)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.104515

We present low temperature tunneling density-of-states measurements in Al films in high parallel magnetic fields. The thickness range of the films, t=6-9 nm, was chosen so that the orbital and Zeeman contributions to their parallel critical fields were comparable. In this quasi-spin paramagnetically limited configuration, the field produces a significant suppression of the gap, and at high fields the gapless state is reached. By comparing measured and calculated tunneling spectra we are able to extract the value of the antisymmetric Fermi-liquid parameter G^0 and thereby deduce the quasiparticle density dependence of the effective parameter G^0_{eff} across the gapless state.

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