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arXiv · 2301.01120

Pressure-Induced Superconductivity in Topological Heterostructure (PbSe)5(Bi2Se3)6

Cuiying Pei·Peng Zhu·Bingtan Li·Yi Zhao·Lingling Gao·Changhua Li·Shihao Zhu·Qinghua Zhang·Tianping Ying·Lin Gu·Bo Gao·Huiyang Gou·Yansun Yao·Jian Sun·Hanyu Liu·Yulin Chen·Zhiwei Wang·Yugui Yao·Yanpeng Qi
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Abstract

Recently, the natural heterostructure of (PbSe)5(Bi2Se3)6 has been theoretically predicted and experimentally confirmed as a topological insulator. In this work, we induce superconductivity in (PbSe)5(Bi2Se3)6 by implementing high pressure. As increasing pressure up to 10 GPa, superconductivity with Tc ~ 4.6 K suddenly appears, followed by an abrupt decrease. Remarkably, upon further compression above 30 GPa, a new superconducting state arises, where pressure raises the Tc to an unsaturated 6.0 K within the limit of our research. Combining XRD and Raman spectroscopies, we suggest that the emergence of two distinct superconducting states occurs concurrently with the pressure-induced structural transition in this topological heterostructure (PbSe)5(Bi2Se3)6.

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Cuiying Pei, Peng Zhu, Bingtan Li, Yi Zhao, Lingling Gao, Changhua Li, Shihao Zhu, Qinghua Zhang, Tianping Ying, Lin Gu, Bo Gao, Huiyang Gou, Yansun Yao, Jian Sun, Hanyu Liu, Yulin Chen, Zhiwei Wang, Yugui Yao, Yanpeng Qi. 2023-01-03. Pressure-Induced Superconductivity in Topological Heterostructure (PbSe)5(Bi2Se3)6. https://arxiv.org/abs/2301.01120

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