Pressure-induced superconductivity in topological insulator Ge2Bi2Te5 and the evolution with Mn doping

Shangjie Tian; Qi Wang; Yuqing Cao; Ying Ma; Xiao Zhang; Yanpeng Qi; Hechang Lei; Shouguo Wang

Pressure-induced superconductivity in topological insulator Ge2Bi2Te5 and the evolution with Mn doping

Superconductivity 2026-01-26 v1 Strongly Correlated Electrons

Authors: Shangjie Tian , Qi Wang , Yuqing Cao , Ying Ma , Xiao Zhang , Yanpeng Qi , Hechang Lei , Shouguo Wang

Abstract

Introducing superconductivity (SC) or magnetism into topological insulators (TIs) can give rise to novel quantum states and exotic physical phenomena. Here, we report a high-pressure transport study on the TI Ge2Bi2Te5 and its Mn-doped counterparts. The application of pressure induces a SC in Ge2Bi2Te5, which shows a dome-shape phase diagram with the maximum Tc of 7.6 K at 23 GPa. Doping Mn into Ge2Bi2Te5 introduces an antiferromagnetic order at ambient pressure and strongly weakens the pressure-induced SC, demonstrating that magnetism and SC compete in this material system. Present study provides a new platform for investigating the interplay among band topology, magnetism, and SC.

Keywords

superconductivity topological insulator pressure effect Mn doping phase diagram

Cite

@article{arxiv.2601.16831,
  title  = {Pressure-induced superconductivity in topological insulator Ge2Bi2Te5 and the evolution with Mn doping},
  author = {Shangjie Tian and Qi Wang and Yuqing Cao and Ying Ma and Xiao Zhang and Yanpeng Qi and Hechang Lei and Shouguo Wang},
  journal= {arXiv preprint arXiv:2601.16831},
  year   = {2026}
}

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8 pages, 4 figures, 1 table

Pressure-induced superconductivity in topological insulator Ge2Bi2Te5 and the evolution with Mn doping

Abstract

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