Pressure-driven superconductivity in the topological insulator GeBi4Te7
Yalei Huang, Na Zuo, Zheyi Zhang, Chunqiang Xu, Xiangzhuo Xing, Wen-He Jiao, Bin Li, Wei Zhou, Xiaobing Liu, Dong Qian, Xiaofeng Xu
DOI 10.1103/6gs6-p872 · Physical Review B
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Abstract
The van der Waals pseudobinary chalcogenides (ACh)m(Pn2Ch3)n (A=Ge,Mn,Pb,etc.; Pn=SborBi; Ch=Te,Se) have recently been reported to host a vast landscape of topological phases of matter, including the quantum anomalous Hall state and topological axion state with a quantized magnetoelectric effect. A subgroup in this series, such as MnSb4Te7 and GeSb4Te7, can be driven to a superconducting state by applying physical pressure, making them viable candidates to realize so-called topological superconductivity. However, the role of magnetic fluctuations in this pressure-induced superconductivity remains unclear. Here, we report pressure-induced superconductivity in nonmagnetic GeBi4Te7, accompanied by the possible structural transitions evidenced from high-pressure Hall effect measurements, Raman scattering, and first-principles calculations. In comparison with other members in this family, we find the superconducting transition temperature of the nonmagnetic subgroup is significantly higher than their magnetic homologs, possibly hinting at the adversary role played by the magnetic fluctuations in the formation of superconductivity, at least in this pseudobinary chalcogenide family.
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. | 7 | Pressure not reported | unknown |
| Sb2Te3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | unknown |
| MnSb4Te7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 50 GPa | unknown |
| GeSb4Te7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | 35 GPa | unknown |
| GeBi4Te7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | 10 GPa | onset |
| GeBi4Te7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | 20 GPa | onset |
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