Measurement of a superconducting energy gap in a homogeneously amorphous insulator

D. Sherman, G. Kopnov, D. Shahar, A. Frydman

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Abstract

We present tunneling spectroscopy measurements that directly reveal the existence of a superconducting gap in the insulating state of homogenously disordered amorphous indium oxide films. Two films on both sides of the disorder induced superconductor to insulator transition show the same energy gap scale. This energy gap persists up to relatively high magnetic fields and is observed across the magnetoresistance peak typical of disordered superconductors. The results provide useful information for understanding the nature of the insulating state in the disorder induced superconductor to insulator transition.

Original languageEnglish
Article number177006
JournalPhysical Review Letters
Volume108
Issue number17
DOIs
StatePublished - 27 Apr 2012

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