Journal
PHYSICAL REVIEW B
Volume 65, Issue 10, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.65.104507
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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 approximate to16 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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