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 LaAlO or LaTiO and SrTiO can arise from a bimodal distribution of mesoscopic local ’s and/or substantial space correlations between the mesoscopic domains.
3 More- Received 18 April 2011
DOI:https://doi.org/10.1103/PhysRevB.84.014514
©2011 American Physical Society