Role of the vortex-core energy on the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN

Details Role of the vortex-core energy on the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN Role of the vortex-core energy on the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN

2011-08-03

arxiv.org/abs/1108.0912v1

Phys. Rev. Lett. 107, 217003 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.107.217003

We analyze the occurrence of the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN at various film thickness, by probing the effect of vortex fluctuations on the temperature dependence of the superfluid density below $T_{BKT}$ and of the resistivity above $T_{BKT}$. By direct comparison between the experimental data and the theory we show the crucial role played by the vortex-core energy in determining the characteristic signatures of the BKT physics, and we estimate its dependence on the disorder level. Our work provides a paradigmatic example of BKT physics in a quasi-two-dimensional superconductor.

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