[18a-223-1~9] 6.3 Oxide electronics

[18a-223-9] Synthesis of layered LiNbO₂ thin films and control of their superconducting properties by using Li-ion charging/discharging reactions

〇(D)Takuto Soma¹, Kohei Yoshimatsu¹, Akira Ohtomo^1,2 (1.Tokyo Tech., Dept. Chem. Sci. Eng., 2.MCES)

Keywords:Layered materials, Superconductivity, Intercalation

Layered LiNbO₂ is a rare material where Nb³⁺ (4d²) and oxygen forms triangular prismatic NbO₆. This triangular prismatic structure is the same as transition metal dichalcogenides MS₂, and superconductivity is reported in Li-deficient phase Li_0.5NbO₂. However, physical properties are not adequately elucidated and synthesis of superconducting thin films has not ever been attained. In this study, we have synthesized superconducting Li_1-xNbO₂ thin films and elucidated various properties. Additionally, changing Li content variously by Li charging/discharging reactions in a electrochemical cell, we have also demonstrated the reversible control of the superconducting properties.