[9a-W933-1~9] 6.3 Oxide electronics

[9a-W933-8] p-type transparent superconductivity in layered LiNbO₂: exotic electronic states associated with the NbO₆ triangular prism

〇(DC)Takuto Soma¹, Kohei Yoshimatsu¹, Koji Horiba^2,3, Hiroshi Kumigashira^2,3, Akira Ohtomo^1,3 (1.Tokyo Tech., Dept. Chem. Sci. Eng., 2.KEK-PF, 3.MCES)

Keywords:Transparent conductor, Superconductivity, p-type

Layered LiNbO₂ becomes a superconductor (T_C = 5.5 K) by inducing Li deficiency. However, its detailed electronic state has not been revealed. We first succeeded in synthesizing superconducting Li_1-xNbO₂ films by using a 3 step synthesis method, and found that it shows both p-type conductivity and high transparency to visible light. In this study, we attempted to figure out the origin of p-type transparent superconductivity through evaluation of electronic states by synchrotron radiation photoelectron spectroscopy.