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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 La3Ni2O7−δ — •Runze Zhang1, Yuichiro Shiroki1,2, Minu Kim1, Pascal Reiss1, and Hidenori Takagi1,2,31Max 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 La3Ni2O7−δ samples. The implications on the critical role of oxygen deficiency will be discussed.

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

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