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: https://journals.aps.org/prl/abstract/10.1103/Phys...
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 |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 105127 |
Deposited On: | 25 Dec 2017 11:42 |
Last Modified: | 25 Dec 2017 11:42 |
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