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Superconductivity-Related Insulating Behavior

2004; American Physical Society; Volume: 92; Issue: 10 Linguagem: Inglês

10.1103/physrevlett.92.107005

1092-0145

G. Sambandamurthy, L. W. Engel, Andreas Johansson, D. Shahar,

Quantum and electron transport phenomena

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, $T_I$. $T_I$ has a maximum value ($T_{I}^p$) that is close to the superconducting transition temperature ($T_c$) at $B$ = 0, suggesting a possible relation between the conduction mechanisms in the superconducting and insulating phases. $T_{I}^p$ and $T_c$ display opposite dependences on the disorder strength.