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

共 41 条

[1] Superconducting phase transitions in ultrathin TiN films [J].

Baturina, T. I. ;

Postolova, S. V. ;

Mironov, A. Yu. ;

Glatz, A. ;

Baklanov, M. R. ;

Vinokur, V. M. .

EPL, 2012, 97 (01)

[2]

BEREZINSKII VL, 1972, SOV PHYS JETP-USSR, V34, P610

[3] Superconducting transitions of intrinsic arrays of weakly coupled one-dimensional superconducting chains: the case of the extreme quasi-1D superconductor Tl2Mo6Se6 [J].

Bergk, B. ;

Petrovic, A. P. ;

Wang, Z. ;

Wang, Y. ;

Salloum, D. ;

Gougeon, P. ;

Potel, M. ;

Lortz, R. .

NEW JOURNAL OF PHYSICS, 2011, 13

[4] Magnetic fluctuations in the classical XY model:: The origin of an exponential tail in a complex system -: art. no. 041106 [J].

Bramwell, ST ;

Fortin, JY ;

Holdsworth, PCW ;

Peysson, S ;

Pinton, JF ;

Portelli, B ;

Sellitto, M .

PHYSICAL REVIEW E, 2001, 63 (04) :411061-411062

[5] Temperature dependence of resistivity and Hall coefficient in strongly disordered NbN thin films [J].

Chand, Madhavi ;

Mishra, Archana ;

Xiong, Y. M. ;

Kamlapure, Anand ;

Chockalingam, S. P. ;

Jesudasan, John ;

Bagwe, Vivas ;

Mondal, Mintu ;

Adams, P. W. ;

Tripathi, Vikram ;

Raychaudhuri, Pratap .

PHYSICAL REVIEW B, 2009, 80 (13)

[6]

Chand Madhavi, 2012, THESIS TATA I FUNDAM

[7] A fluctuation-based characterization of athermal phase transitions: Application to shape memory alloys [J].

Chandni, U. ;

Kar-Narayan, Sohini ;

Ghosh, Arindam ;

Vijaya, H. S. ;

Mohan, S. .

ACTA MATERIALIA, 2009, 57 (20) :6113-6122

[8] Criticality of Tuning in Athermal Phase Transitions [J].

Chandni, U. ;

Ghosh, Arindam ;

Vijaya, H. S. ;

Mohan, S. .

PHYSICAL REVIEW LETTERS, 2009, 102 (02)

[9] Superconducting properties and Hall effect of epitaxial NbN thin films [J].

Chockalingam, S. P. ;

Chand, Madhavi ;

Jesudasan, John ;

Tripathi, Vikram ;

Raychaudhuri, Pratap .

PHYSICAL REVIEW B, 2008, 77 (21)

[10] Fluctuations, dissipation, and nonuniversal superfluid jumps in two-dimensional superconductors [J].

Crane, R. W. ;

Armitage, N. P. ;

Johansson, A. ;

Sambandamurthy, G. ;

Shahar, D. ;

Gruner, G. .

PHYSICAL REVIEW B, 2007, 75 (09)

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