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.
@article{arxiv.2301.01120,
title = {Pressure-Induced Superconductivity in Topological Heterostructure (PbSe)5(Bi2Se3)6},
author = {Cuiying Pei and Peng Zhu and Bingtan Li and Yi Zhao and Lingling Gao and Changhua Li and Shihao Zhu and Qinghua Zhang and Tianping Ying and Lin Gu and Bo Gao and Huiyang Gou and Yansun Yao and Jian Sun and Hanyu Liu and Yulin Chen and Zhiwei Wang and Yugui Yao and Yanpeng Qi},
journal= {arXiv preprint arXiv:2301.01120},
year = {2023}
}