Superconductivity-Related Insulating Behavior

Details Superconductivity-Related Insulating Behavior Superconductivity-Related Insulating Behavior

2003-07-25

arxiv.org/abs/cond-mat/0307648v2

Phys. Rev. Lett. 92, 107005 (2004).

Physics

Condensed Matter

Superconductivity

Tex file and 5 figures; Revised version; To appear in Phys. Rev. Lett. (2004)

Scientific paper

10.1103/PhysRevLett.92.107005

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.

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