Superconductivity in the pressure-amorphized topological insulator CrP4
Chutong Zhang, Xiangzhuo Xing, Na Zuo, Bowen Zheng, Bin Li, Jiajia Feng, Xiaolei Yi, Yan Meng, Xiaoran Zhang, Bingchao Yang, Chao Wang, Xin Chen, Yongsheng Zhang, Xiaofeng Xu, Xiaobing Liu
DOI 10.1103/3k5r-qr3n · Physical Review B
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Abstract
The interplay among superconductivity, magnetism, and nontrivial band topology represents one of the most compelling frontiers in condensed matter physics. The exploration of novel superconductivity in 3d transition-metal compounds, particularly the rare Cr-based systems containing strongly magnetic Cr ions, has long attracted attention owing to their unconventional pairing mechanisms that challenge conventional wisdom. Yet, Cr-based superconductors remain scarce, especially those possessing nontrivial topological character, underscoring the urgent need to uncover new members. Here we report the observation of superconductivity in the pressure-amorphized Cr-based topological insulator CrP4. Upon compression, CrP4 undergoes an anomalous quantum phase transition from a metallic to a semiconductinglike state at around 15 GPa, driven by significant changes in the electronic structure. At approximately 70 GPa, re-metallization with superconductivity occurs alongside an irreversible amorphization. The superconducting transition temperature Tc increases monotonically with pressure, reaching 4.8 K at 141.3 GPa. Furthermore, theoretical calculations predict multiple topological phase transitions from a strong topological insulator to a trivial state and finally back to a strong topological state under pressure. Our study not only establishes CrP4 as the first Cr-based amorphous superconductor but also opens a new paradigm for exploring superconducting and topological properties in amorphous materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CrP4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | 141.3 GPa | unknown |
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