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arXiv 1408.3673cond-mat.supr-con
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无序材料中超导电性的破坏:一个维度交叉

Destruction of superconductivity in disordered materials : a dimensional crossover

O. Crauste, F. Couëdo, L. Bergé, C. A. Marrache-Kikuchi, L. Dumoulin

摘要:

通过改变样品厚度$d$,研究了不同Nb组分$x$的非晶Nb $_{x}$ Si $_{1-x}$二维薄膜中无序诱导的超导体-绝缘体转变.我们表明,临界厚度$d_c$,从绝缘的超导制度,随着减少$x$强烈增加,从而达到超过100欧姆的值。相应的相图中的$(d, x)$平面推断和相关的三维情况。二维的超导体到绝缘体的转变与三维的超导体到金属的转变良好连接。

英文摘要:

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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