Scanning tunnelling spectroscopy of superconductivity on surfaces of LiTi₂O₄(111) thin films.

ABSTRACT: Unique superconductivity at surfaces/interfaces, as exemplified by LaAlO₃/SrTiO₃ interfaces, and the high transition temperature in ultrathin FeSe films, have triggered intense debates on how superconductivity is affected in atomic and electronic reconstructions. The surface of superconducting cubic spinel oxide LiTi₂O₄ is another interesting system because its inherent surface electronic and atomic reconstructions add complexity to superconducting properties. Investigations of such surfaces are hampered by the lack of single crystals or high-quality thin films. Here, using low-temperature scanning tunnelling microscopy and spectroscopy, we report an unexpected small superconducting energy gap and a long coherence length on the surface of LiTi

SUBMITTER: Okada Y 

PROVIDER: S-EPMC5500876 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature