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arXiv 1104.3430cond-mat.supr-concond-mat.dis-nn
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超导层的有效介质理论:包括空间相关效应的系统分析

Effective medium theory for superconducting layers: A systematic analysis including space correlation effects

S. Caprara, M. Grilli, L. Benfatto, C. Castellani

摘要:

我们研究了介观不均匀性对几个二维电子系统中金属-超导体相变的影响。具体来说,作为一个模型的系统介观不均匀性,我们考虑一个随机电阻网络,我们解决了一个精确的数值方法和有效介质理论。我们发现,在这些二维超导体的过渡的宽度主要是由无序,而不是由波动。我们还发现,“尾”功能之间的界面LaAlO 3或LaTiO 3和SrTiO 3的电阻率曲线可以产生从介观局部Tc的双峰分布和/或大量的空间介观域之间的相关性。

英文摘要:

We investigate the effects of mesoscopic inhomogeneities on the metal-superconductor transition occurring in several two-dimensional electron systems. Specifically, as a model of systems with mesoscopic inhomogeneities, we consider a random-resistor network, which we solve both with an exact numerical approach and by the effective medium theory. We find that the width of the transition in these two-dimensional superconductors is mainly ruled by disorder rather than by fluctuations. We also find that "tail" features in resistivity curves of interfaces between LaAlO3 or LaTiO3 and SrTiO3 can arise from a bimodal distribution of mesoscopic local Tc's and/or substantial space correlations between the mesoscopic domains.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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