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Thickness-tuned superconductor-insulator transitions under magnetic field in a -NbSi

C. Marrache-Kikuchi 1 H. Aubin 2 A. Pourret 2 K. Behnia 2 J. Lesueur 2 L. Bergé 3 L. Dumoulin 3
1 CSNSM PS1
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
2 LPEM - Laboratoire de Physique et d'Etude des Matériaux (UMR 8213)
3 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Abstract : We have studied the thickness-induced superconductor-to-insulator transition in the presence of a magnetic field for a -NbSi thin films. Analyzing the critical behavior of this system within the "dirty boson model," we have found a critical exponent product of νd ztilde 0.4 . The corresponding phase diagram in the (H,d) plane is inferred. This small exponent product, as well as the nonuniversal value of the critical resistance found at the transition, calls for further investigations in order to thoroughly understand these transitions.
Keywords : Properties of type I and type II superconductors Fluctuations Metal-insulator transitions and other electronic transitions General studies of phase transitions
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http://hal.in2p3.fr/in2p3-00855475
Contributor : Christine Hadrossek <>
Submitted on : Thursday, August 29, 2013 - 2:41:39 PM
Last modification on : Sunday, June 20, 2021 - 3:46:23 AM

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C. Marrache-Kikuchi, H. Aubin, A. Pourret, K. Behnia, J. Lesueur, et al.. Thickness-tuned superconductor-insulator transitions under magnetic field in a -NbSi. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2008, 78, pp.144520. ⟨10.1103/PHYSREVB.78.144520⟩. ⟨in2p3-00855475⟩

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