Correlated Conductance Fluctuations Close to the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin NbN Films

被引：34

作者：

Koushik, R. ^{[1
]}

Kumar, Siddhartha ^{[1
]}

Amin, Kazi Rafsanjani ^{[1
]}

Mondal, Mintu ^{[2
]}

Jesudasan, John ^{[2
]}

Bid, Aveek ^{[1
]}

Raychaudhuri, Pratap ^{[2
]}

Ghosh, Arindam ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[2] Tata Inst Fundamental Res, Mumbai 400005, Maharashtra, India

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 19期

关键词：

GAUSSIAN 1/F NOISE; 2-DIMENSIONAL SUPERCONDUCTOR; PHASE-TRANSITIONS; FLUX LATTICES; COULOMB-GAS; SYSTEMS; ORDER; TRANSPORT; DISORDER; STATES;

D O I：

10.1103/PhysRevLett.111.197001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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