Superconductivity-related insulating behavior.


We present the results of an experimental study of superconducting, disordered, thin films of amorphous indium oxide. These films can be driven from the superconducting phase to a reentrant insulating state by the application of a perpendicular magnetic field (B). We find that the high-B insulator exhibits activated transport with a characteristic temperature, TI. TI has a maximum value (TpI) that is close to the superconducting transition temperature (Tc) at B=0, suggesting a possible relation between the conduction mechanisms in the superconducting and insulating phases. Tp(I) and Tc display opposite dependences on the disorder strength.

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@article{Sambandamurthy2004SuperconductivityrelatedIB, title={Superconductivity-related insulating behavior.}, author={G. Sambandamurthy and L. W. Engel and August Johansson and Dan Shahar}, journal={Physical review letters}, year={2004}, volume={92 10}, pages={107005} }