[23a-A307-1~9] 6.3 Oxide electronics

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[23a-A307-3] Improvement of superconducting properties in infinite-layer nickelates by tuning topochemical reduction temperature

〇Motoki Osada¹, Kohei Fujiwara¹, Tsutomu Nojima¹, Atsushi Tsukazaki¹ (1.IMR, Tohoku Univ.)

Keywords:

Nickelate,Superconductivity,Topochemical reduction

Since the discovery of superconductivity in infinite-layer nickelates, research has been focused on understanding the mechanism of superconductivity in relation to cuprates, which are typical unconventional superconductors. However, investigations of superconductivity in infinite-layer nickelates are limited by the available experimental techniques, as these materials can only be obtained through topochemical reduction reactions. In this study, our attention was directed toward the topochemical reduction reaction, which selectively removes apical oxygens from the NiO₆ octahedra of the precursor perovskite phase. By adjusting the reduction temperature, we successfully improved the superconducting properties of La_1-xSr_xNiO₂. Along with the improvement of superconducting properties, we will also discuss the changes in crystal structure and transport properties of La_1-xSr_xNiO₂ thin films by the topochemical reduction reaction.