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- W2000955325 abstract "Using scanning tunneling spectroscopy, we address the problem of the superconductor-insulator phase transition in homogeneously disordered ultrathin (2--15 nm) films of NbN. Samples thicker than 8 nm, for which the Ioffe-Regel parameter ${k}_{F}lensuremath{ge}5.6$, manifest a conventional superconductivity: a spatially homogeneous BCS-like gap, vanishing at the critical temperature, and a disordered vortex lattice in magnetic field. Upon thickness reduction, however, while ${k}_{F}l$ lowers, the STS reveals striking deviations from the BCS scenario, among which a progressive decrease of the coherence peak height and small spatial inhomogeneities. In addition, the gap below ${T}_{C}$ develops on a spectral background, which becomes more and more ``V-shaped'' approaching the localization. The thinnest film (2.16 nm), while not being exactly at the superconductor-insulator transition (SIT) (${T}_{C}ensuremath{approx}0.4{T}_{C}^{mathrm{bulk}}$), showed unconventional signatures such as the vanishing of the coherence peaks and the absence of vortices. This behavior suggests a weakening of long-range phase coherence, when approaching the SIT in this quasi-2D limit." @default.
- W2000955325 created "2016-06-24" @default.
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- W2000955325 date "2013-07-03" @default.
- W2000955325 modified "2023-09-30" @default.
- W2000955325 title "Unconventional superconductivity in ultrathin superconducting NbN films studied by scanning tunneling spectroscopy" @default.
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- W2000955325 doi "https://doi.org/10.1103/physrevb.88.014503" @default.
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