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 T-c's and/or substantial space correlations between the mesoscopic domains.

Effective medium theory for superconducting layers: A systematic analysis including space correlation effects / Caprara, Sergio; Grilli, Marco; Benfatto, L.; Castellani, Claudio. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:1(2011), pp. 014514-1-014514-11. [10.1103/physrevb.84.014514]

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

CAPRARA, SERGIO;GRILLI, Marco;L. Benfatto;CASTELLANI, Claudio
2011

Abstract

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 T-c's and/or substantial space correlations between the mesoscopic domains.
2011
01 Pubblicazione su rivista::01a Articolo in rivista
Effective medium theory for superconducting layers: A systematic analysis including space correlation effects / Caprara, Sergio; Grilli, Marco; Benfatto, L.; Castellani, Claudio. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:1(2011), pp. 014514-1-014514-11. [10.1103/physrevb.84.014514]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/356671
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