Evidence for a Finite-Temperature Insulator

نویسندگان

  • M. Ovadia
  • D. Kalok
  • I. Tamir
  • S. Mitra
  • B. Sacépé
  • D. Shahar
چکیده

In superconductors the zero-resistance current-flow is protected from dissipation at finite temperatures (T) by virtue of the short-circuit condition maintained by the electrons that remain in the condensed state. The recently suggested finite-T insulator and the "superinsulating" phase are different because any residual mechanism of conduction will eventually become dominant as the finite-T insulator sets-in. If the residual conduction is small it may be possible to observe the transition to these intriguing states. We show that the conductivity of the high magnetic-field insulator terminating superconductivity in amorphous indium-oxide exhibits an abrupt drop, and seem to approach a zero conductance at T < 0.04 K. We discuss our results in the light of theories that lead to a finite-T insulator.

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عنوان ژورنال:

دوره 5  شماره 

صفحات  -

تاریخ انتشار 2015