Tunneling study in granular aluminum near the Mott metal-to-insulator transition

Aviv Glezer Moshe, Gal Tuvia, Shilo Avraham, Eli Farber, Guy Deutscher

Research output: Contribution to journalArticlepeer-review

Abstract

We find excellent agreement between tunneling and optical conductivity gap values in superconducting. granular aluminum films, up to the metal-to-insulator transition. This behavior, in strong contrast with that recently reported in atomically disordered samples for which the optical gap becomes smaller than the tunneling gap, suggests that disorder is not at the origin of the transition. The large increase seen in the strong-coupling ratio and a finite value of the gap at Tc near the metal-to-insulator transition are consistent with a BCS-to-BEC crossover.

Original languageEnglish
Article number054508
JournalPhysical Review B
Volume104
Issue number5
DOIs
StatePublished - 1 Aug 2021

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