Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Nickelates I

TT 5.4: Talk

Monday, March 18, 2024, 10:15–10:30, H 3007

Investigation of Superconducting Phase in Polycrystalline La₃Ni₂O_7−δ — •Runze Zhang¹, Yuichiro Shiroki^1,2, Minu Kim¹, Pascal Reiss¹, and Hidenori Takagi^1,2,3 — ¹Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — ²University of Tokyo, Tokyo 113-0033, Japan — ³Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany

The recent discovery of superconductivity in Ruddlesden-Popper (RP) nickelate La₃Ni₂O₇ under pressure has attracted significant research attention. However, the exact phase that facilitates this superconductivity remains unidentified, partly due to the complexities in managing RP stacking faults in single crystals. To address this issue, we present a comprehensive growth study focusing on identifying the potential superconducting phase using high-quality pure-phase polycrystalline La₃Ni₂O_7−δ samples. The implications on the critical role of oxygen deficiency will be discussed.

Keywords: Superconductivity; Ruddlesden-Popper structure; High-pressure