[15p-W9_325-1~12] 11.1 Fundamental properties

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)

[15p-W9_325-4] HAXPES and XAS study on superconducting Pr₂CuO₄ films

〇Hideki Yamamoto¹, Yoshiharu Krockenberger¹, Ai Ikeda¹, Yoshitaka Taniyasu¹ (1.NTT BRL)

Keywords:

superconductivity,cuprates,electronic structures

In T′- and infinite-layer-structure cuprates comprised solely of square-planar CuO₂ planes, we have reported the emergence of superconductivity in undoped and lightly doped regimes achieved through defect reduction. Recently, similar phenomena have also been reported for square-planar CuO₂ planes sandwiched between pyramidal five-coordinated CuO₂ planes, calling for a reexamination of the intrinsic electronic structure of square-planar CuO₂ planes. From this perspective, we investigated the electronic structure of superconducting Pr₂CuO₄ thin films—on which only limited reports from other institutions exist—using HAXPES and TEY-XAS. Our results suggest that, in square-planar CuO₂ planes, the conventional picture in which the parent compounds possess a charge-transfer gap that disappears upon doping may not be valid.