Evidence of spatial inhomogeneity near the onset of magnetically induced insulating state in superconducting thin films

Details Evidence of spatial inhomogeneity near the onset of magnetically induced insulating state in superconducting thin films Evidence of spatial inhomogeneity near the onset of magnetically induced insulating state in superconducting thin films

2006-09-05

arxiv.org/abs/cond-mat/0609107v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.74.100507

Non-monotonic differential resistance (dV/dI) is observed in magnetically induced insulating films which exhibit apparent superconductor-metal-insulator transitions in the low temperature limit; at low bias currents the nonlinear transport is insulator-like while at high bias currents it is characteristic of metallic phase. The non-monotonic dV/dI may be evidence that the insulating state consists of metallic domains connected by point contacts (insulating gaps), implying that spatial inhomogeneities play a dominant role in determining the nature of the apparent metal-insulator transition.

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