Berezinskii-Kosterlitz-Thouless phase transition in nanoporous films of superconducting NbN
A. Verma, R. Vedin, J. Jesudasan, J. Lidmar, I. Maccari, S. Bose
DOI 10.1103/p1t4-hst3 · Physical Review B
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Abstract
We present a study of the Berezinskii-Kosterlitz-Thouless (BKT) transition in mildly disordered NbN nanoporous (NP) films. The measured superfluid stiffness, Js, is found to be much lower than that predicted considering a reduced geometric area. For a 5 nm thick NP film, a distinct BKT transition is observed. By fitting the experimental data via the BKT renormalization-group equations, we show how both Js and the vortex-core energy, μ, decrease in the presence of nanopores. The variation of Js and μ is also reproduced theoretically via Monte Carlo numerical simulations on a 2D diluted XY model. Our results show that nanopore geometries effectively enhance the 2D nature of the superconducting films, increasing the parameter space to explore the BKT physics while offering a pathway to systematically control the two energy scales, Js and μ, that govern the vortex physics in these systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | Pressure not reported | onset |
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