Reversible superconductor-insulator transition in LiTi 2 O 4 induced by Li-ion electrochemical reaction

K. Yoshimatsu, M. Niwa, H. Mashiko, T. Oshima, A. Ohtomo

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Transition metal oxides display various electronic and magnetic phases such as high-temperature superconductivity. Controlling such exotic properties by applying an external field is one of the biggest continuous challenges in condensed matter physics. Here, we demonstrate clear superconductor-insulator transition of LiTi 2 O 4 films induced by Li-ion electrochemical reaction. A compact electrochemical cell of pseudo-Li-ion battery structure is formed with a superconducting LiTi 2 O 4 film as an anode. Li content in the film is controlled by applying a constant redox voltage. An insulating state is achieved by Li-ion intercalation to the superconducting film by applying reduction potential. In contrast, the superconducting state is reproduced by applying oxidation potential to the Li-ion intercalated film. Moreover, superconducting transition temperature is also recovered after a number of cycles of Li-ion electrochemical reactions. This complete reversible transition originates in difference in potentials required for deintercalation of initially contained and electrochemically intercalated Li + ions.

Original languageEnglish
Article number16325
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Nov 6
Externally publishedYes

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