Discovery of the High‐Entropy Carbide Ceramic Topological Superconductor Candidate (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C

High‐entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near‐equal atomic ratios of multi‐principal elements. Material design and property tailoring possibilities emerge from this new class of materials. Herein, the discovery of super...

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Published in:Advanced functional materials 2023-10, Vol.33 (40), p.n/a
Main Authors: Zeng, Lingyong, Wang, Zequan, Song, Jing, Lin, Gaoting, Guo, Ruixin, Luo, Si‐Chun, Guo, Shu, Li, Kuan, Yu, Peifeng, Zhang, Chao, Guo, Wei‐Ming, Ma, Jie, Hou, Yusheng, Luo, Huixia
Format: Article
Language:English
Subjects:
Carbides
Ceramics
Density functional theory
Entropy
high pressure
high‐entropy ceramic
Inorganic compounds
Materials science
Orbitals
Physical properties
Solid solutions
Structural stability
Superconductivity
topological superconductor
Topological superconductors
Transition metals
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Summary:High‐entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near‐equal atomic ratios of multi‐principal elements. Material design and property tailoring possibilities emerge from this new class of materials. Herein, the discovery of superconductivity 2.35 K and topological properties in the (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C high‐entropy carbide ceramic (HECC) is reported, which is not observed before in any of the investigated HECC. Density functional theory calculations show that six type‐II Dirac points exist in (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C, which mainly contributed from the t2g orbitals of transition metals and the p orbitals of C. Due to the stability of the structure, robust superconductivity (SC) under pressure in this HEC superconductor is also observed. This study expands the physical properties of HECs, which may become a new material platform for SC research, especially for studying the coupling between SC and topological physics. The discovery of superconductivity and topological properties in the (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C high‐entropy carbide ceramic, which is not observed in any of the investigated high‐entropy carbide ceramic and suggesting it is a potential topological superconductor. Also, experiments show the robustness of superconductivity under pressure in the (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C high‐entropy carbide ceramic.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202301929