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Probing long-range correlations in the Berezinskii-Kosterlitz-Thouless fluctuation regime of ultra-thin NbN superconducting films using transport noise measurements

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arxiv 1308.4234 v2 pith:OPZIRC2H submitted 2013-08-20 cond-mat.supr-con

R. Koushik , Siddhartha Kumar , Kazi Rafsanjani Amin , Mintu Mondal , John Jesudasan , Aveek Bid , Pratap Raychaudhuri , Arindam Ghosh This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductingfilmsfluctuationsberezinskii-kosterlitz-thoulesscorrelationsfieldfoundlong-range
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We probe the presence of long-range correlations in phase fluctuations by analyzing the higher-order spectrum of resistance fluctuations in ultra-thin 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 depend 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.

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