Journal Article Reversible superconductor-insulator transition in LiTi<sub>2</sub>O<sub>4</sub> induced by Li-ion electrochemical reaction

吉松, 公平  ,  Yoshimatsu, Kohei  ,  丹羽, 三冬  ,  Niwa, Mifuyu  ,  増子, 尚徳  ,  Mashiko, Hisanori  ,  大島, 孝仁  ,  OSHIMA, Takayoshi  ,  大友, 明  ,  Ohtomo, Akira

5 ( 16325 ) 2015-11 , Macmillan Publishers Limited
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 LiTi2O4 films induced by Li-ion electrochemical reaction. A compact electrochemical cell of pseudo-Li-ion battery structure is formed with a superconducting LiTi2O4 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.

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