Superconductivity in Trilayer Nickelate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>La</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>4</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi>Ni</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> under Pressure
Mingxin Zhang, Cuiying Pei, Di Peng, Xian Du, Weixiong Hu, Yantao Cao, Qi Wang, Juefei Wu, Yidian Li, Huanyu Liu, Chenhaoping Wen, Jing Song, Yi Zhao, Changhua Li, Weizheng Cao, Shihao Zhu, Qing Zhang, Na Yu, Peihong Cheng, Lili Zhang, Zhiwei Li, Jinkui Zhao, Yulin Chen, Changqing Jin, Hanjie Guo, Congjun Wu, Fan Yang, Qiaoshi Zeng, Shichao Yan, Lexian Yang, Yanpeng Qi
Abstract
Nickelate superconductors have attracted a great deal of attention over the past few decades due to their similar crystal and electronic structures with high-temperature cuprate superconductors. Here, we report superconductivity in a pressurized Ruddlesden-Popper phase single crystal <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:msub> <a:mrow> <a:mi>La</a:mi> </a:mrow> <a:mrow> <a:mn>4</a:mn> </a:mrow> </a:msub> <a:msub> <a:mrow> <a:mi>Ni</a:mi> </a:mrow> <a:mrow> <a:mn>3</a:mn> </a:mrow> </a:msub> <a:msub> <a:mrow> <a:mi mathvariant="normal">O</a:mi> </a:mrow> <a:mrow> <a:mn>10</a:mn> </a:mrow> </a:msub> <a:mo stretchy="false">(</a:mo> <a:mi>n</a:mi> <a:mo>=</a:mo> <a:mn>3</a:mn> <a:mo stretchy="false">)</a:mo> </a:mrow> </a:math> and its interplay with the density wave order in the phase diagram. With increasing pressure, the density wave order, as indicated by the anomaly in the resistivity, is progressively suppressed, followed by the emergence of superconductivity around 25 K under the <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"> <f:mrow> <f:mi>I</f:mi> <f:mn>4</f:mn> <f:mo>/</f:mo> <f:mi>m</f:mi> <f:mi>m</f:mi> <f:mi>m</f:mi> </f:mrow> </f:math> space group. The susceptibility measurements confirm bulk superconductivity with a volume fraction exceeding 80%. Moreover, theoretical analysis unveils that antiferromagnetic superexchange interactions can serve as the effective pairing interaction for the emergence of superconductivity in pressurized <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"> <h:mrow> <h:msub> <h:mrow> <h:mi>La</h:mi> </h:mrow> <h:mrow> <h:mn>4</h:mn> </h:mrow> </h:msub> <h:msub> <h:mrow> <h:mi>Ni</h:mi> </h:mrow> <h:mrow> <h:mn>3</h:mn> </h:mrow> </h:msub> <h:msub> <h:mrow> <h:mi mathvariant="normal">O</h:mi> </h:mrow> <h:mrow> <h:mn>10</h:mn> </h:mrow> </h:msub> </h:mrow> </h:math> . Our research provides a new platform for the investigation of the unconventional superconductivity mechanism in Ruddlesden-Popper trilayer perovskite nickelates.