Pressure-induced superconductivity in magnetic topological insulator candidate MnSb4Te7
Cuiying Pei (裴翠颖), Ming Xi (席明), Qi Wang (王琦), Wujun Shi (史武军), Juefei Wu (吴珏霏), Lingling Gao (高玲玲), Yi Zhao (赵毅), Shangjie Tian (田尚杰), Weizheng Cao (曹渭征), Changhua Li (李昌华), Mingxin Zhang (张明鑫), Shihao Zhu (朱世豪), Yulin Chen (陈宇林), Hechang Lei (雷和畅), Yanpeng Qi (齐彦鹏)
DOI 10.1103/PhysRevMaterials.6.L101801 · Physical Review Materials
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Abstract
The magnetic van der Waals crystals (MnX2Te4)m(X2Te3)n (X=Sb,Bi) have drawn significant attention due to their rich topological properties and tenability by external magnetic field. In this letter, we report on the discovery of superconductivity in magnetic topological insulator candidate MnSb4Te7 (m=1, n=1) via the application of high pressure. The antiferromagnetic ordering is robust to pressure until 8 GPa and then fully suppressed. The carrier type converts from hole to electron accompanied with structural phase transition at ∼16GPa. Superconductivity emerges near the critical pressure 30 GPa where MnSb4Te7 converts to phase III. Interestingly, MnSb4Te7 shows a domelike phase diagram with a maximum Tc of 2.2 K at 50.7 GPa.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 11 GPa | unknown |
| MnSb4Te7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.9 | 32.1 GPa | onset |
| MnSb4Te7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 50.7 GPa | onset |
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