[17p-Z20-1~13] 11.1 Fundamental properties

[17p-Z20-6] Superconductivity in Pr₂Ba₄Cu₇O_15-δ:Cu Nuclear-Spin Evidence of No Contribution of CuO₂ Planes to Superconductivity

Sotaro Nishioka¹, Shunsaku Nakagawa¹, Mitsuharu Yashima¹, Hidekazu Mukuda¹, Mamoru Yogi², Kosuke Ikeda³, Dwi Prananto^3,4, 〇Susumu Sasaki^3,4, Jun-ichi Shimoyama⁵ (1.Osaka Univ., 2.Ryukyu Univ., 3.Niibara Univ., 4.AMED, 5.Aoyama Univ.)

Keywords:cuprate superconductor, nuclear magnetic resonance, chain-driven superconductivity

Unlike all the other cuprate superconductors, it is not the CuO₂ planes but Cu₂O₂ zigzag chains that drive the superconductivity of Pr₂Ba₄Cu₇O_15-δ (“Pr247”), which consists of PrBa₂Cu₃O₇ (“Pr123”) and PrBa₂Ba₄O₈ (“Pr124”), i.e., “Pr247” = “Pr123” + “Pr124”. Here, using home-built NMR system on a well-characterized Pr247 sample synthesized without the process of high-oxygen pressure, we have experimentally clarified that the CuO₂ planes do not contribute to the emergence of superconductivity in the Pr247.