title: Evidence for a Finite-Temperature Insulator.
abstract: 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.
authors: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors: M
authors: M
authors: Ovadia
authors: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors: D
authors: D
authors: Kalok
authors: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors: I
authors: I
authors: Tamir
authors: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors: S
authors: S
authors: Mitra
authors: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.|Univ. Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France.|CNRS, Institut NEEL, F-38042 Grenoble, France.
authors: B
authors: B
authors: Sacépé
authors: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors: D
authors: D
authors: Shahar