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Destruction of superconductivity in disordered materials : a dimensional crossover

O. Crauste 1 F. Couëdo 1 L. Bergé 2 C. A. Marrache-Kikuchi 1 L. Dumoulin 3
2 CSNSM INSTR
CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
3 CSNSM PS1
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : The disorder-induced Superconductor-to-Insulator Transition in amorphous Nb$_{x}$Si$_{1-x}$ two-dimensional thin films is studied for different niobium compositions $x$ through a variation of the sample thickness $d$. We show that the critical thickness $d_c$, separating a superconducting regime from an insulating one, increases strongly with diminishing $x$, thus attaining values of over 100 {Å}. The corresponding phase diagram in the $(d, x)$ plane is inferred and related to the three-dimensional situation. The two-dimensional Superconductor-to-Insulator Transition well connects with the three-dimensional Superconductor-to-Metal Transition.
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http://hal.in2p3.fr/in2p3-01068379
Contributor : Emilie Bonnardel <>
Submitted on : Thursday, September 25, 2014 - 3:38:29 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:22 PM

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O. Crauste, F. Couëdo, L. Bergé, C. A. Marrache-Kikuchi, L. Dumoulin. Destruction of superconductivity in disordered materials : a dimensional crossover. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2014, 90, pp.060203(R). ⟨10.1103/PhysRevB.90.060203⟩. ⟨in2p3-01068379⟩

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