Phase coherence phenomena in superconducting films

Details Phase coherence phenomena in superconducting films Phase coherence phenomena in superconducting films

2001-11-02

arxiv.org/abs/cond-mat/0111039v1

Phys. Rev. B 65, 144518 (2002)

Physics

Condensed Matter

Superconductivity

13 pages, 8 figures included

Scientific paper

10.1103/PhysRevB.65.144518

Superconducting films subject to an in-plane magnetic field exhibit a gapless superconducting phase. We explore the quasi-particle spectral properties of the gapless phase and comment on the transport properties. Of particular interest is the sensitivity of the quantum interference phenomena in this phase to the nature of the impurity scattering. We find that films subject to columnar defects exhibit a `Berry-Robnik' symmetry which changes the fundamental properties of the system. Furthermore, we explore the integrity of the gapped phase. As in the magnetic impurity system, we show that optimal fluctuations of the random impurity potential conspire with the in-plane magnetic field to induce a band of localized sub-gap states. Finally, we investigate the interplay of the proximity effect and gapless superconductivity in thin normal metal-superconductor bi-layers.

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