Correlated conductance fluctuations close to the Berezinskii-Kosterlitz-Thouless transition in ultrathin NbN films

Koushik, R. ; Kumar, Siddhartha ; Amin, Kazi Rafsanjani ; Mondal, Mintu ; Jesudasan, John ; Bid, Aveek ; Raychaudhuri, Pratap ; Ghosh, Arindam (2013) Correlated conductance fluctuations close to the Berezinskii-Kosterlitz-Thouless transition in ultrathin NbN films Physical Review Letters, 111 (19). Article ID 197001. ISSN 0031-9007

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Official URL: http://journals.aps.org/prl/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevLett.111.197001

Abstract

We probe the presence of long-range correlations in phase fluctuations by analyzing the higher-order spectrum of resistance fluctuations in ultrathin NbN superconducting films. The non-Gaussian component of resistance fluctuations is found to be sensitive to film thickness close to the transition, which allows us to distinguish between mean field and Berezinskii-Kosterlitz-Thouless (BKT) type superconducting transitions. The extent of non-Gaussianity was found to be bounded by the BKT and mean field transition temperatures and depends strongly on the roughness and structural inhomogeneity of the superconducting films. Our experiment outlines a novel fluctuation-based kinetic probe in detecting the nature of superconductivity in disordered low-dimensional materials.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:101512
Deposited On:01 Feb 2018 10:04
Last Modified:01 Feb 2018 10:04

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