Granularity-induced gapless superconductivity in NbN films: evidence of thermal phase fluctuations

Details Granularity-induced gapless superconductivity in NbN films: evidence of thermal phase fluctuations Granularity-induced gapless superconductivity in NbN films: evidence of thermal phase fluctuations

2002-01-17

arxiv.org/abs/cond-mat/0201296v1

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.104507

Using a single coil mutual inductance technique, we measure the low temperature dependence of the magnetic penetration depth in superconducting NbN films prepared with similar critical temperatures around 16 K but with different microstructures. Only (100) epitaxial and weakly granular (100) textured films display the characteristic exponential dependence of conventional BCS s-wave superconductors. More granular (111) textured films exhibit a linear dependence, indicating a gapless state in spite of the s-wave gap. This result is quantitatively explained by a model of thermal phase fluctuations favored by the granular structure.

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