Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi

Details Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi Thickness-tuned Superconductor-to-Insulator Transitions under magnetic field in a-NbSi

2008-10-13

arxiv.org/abs/0810.2321v1

Physics

Condensed Matter

Superconductivity

7 pages, 7 figures, to be published in PRB

Scientific paper

10.1103/PhysRevB.78.144520

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 exponents product of $\nu_d z$ > 0.4. The corresponding phase diagram in the (H,d) plane is inferred. This small exponent product as well as the non-universal value of the critical resistance found at the transition call for further investigations in order to thoroughly understand these transitions.

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