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Zeng L, Hu X, Zhou Y, Boubeche M, Guo R, Liu Y, Luo SC, Guo S, Li K, Yu P, Zhang C, Guo WM, Sun L, Yao DX, Luo H. Superconductivity in the High-Entropy Ceramics Ti 0.2 Zr 0.2 Nb 0.2 Mo 0.2 Ta 0.2 C x with Possible Nontrivial Band Topology. Adv Sci (Weinh) 2024; 11:e2305054. [PMID: 38050864 PMCID: PMC10837384 DOI: 10.1002/advs.202305054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 10/04/2023] [Indexed: 12/07/2023]
Abstract
Topological superconductors have drawn significant interest from the scientific community due to the accompanying Majorana fermions. Here, the discovery of electronic structure and superconductivity (SC) in high-entropy ceramics Ti0.2 Zr0.2 Nb0.2 Mo0.2 Ta0.2 Cx (x = 1 and 0.8) combined with experiments and first-principles calculations is reported. The Ti0.2 Zr0.2 Nb0.2 Mo0.2 Ta0.2 Cx high-entropy ceramics show bulk type-II SC with Tc ≈ 4.00 K (x = 1) and 2.65 K (x = 0.8), respectively. The specific heat jump (∆C/γTc ) is equal to 1.45 (x = 1) and 1.52 (x = 0.8), close to the expected value of 1.43 for the BCS superconductor in the weak coupling limit. The high-pressure resistance measurements show a robust SC against high physical pressure in Ti0.2 Zr0.2 Nb0.2 Mo0.2 Ta0.2 C, with a slight Tc variation of 0.3 K within 82.5 GPa. Furthermore, the first-principles calculations indicate that the Dirac-like point exists in the electronic band structures of Ti0.2 Zr0.2 Nb0.2 Mo0.2 Ta0.2 C, which is potentially a topological superconductor. The Dirac-like point is mainly contributed by the d orbitals of transition metals M and the p orbitals of C. The high-entropy ceramics provide an excellent platform for the fabrication of novel quantum devices, and the study may spark significant future physics investigations in this intriguing material.
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Affiliation(s)
- Lingyong Zeng
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, 510275, China
| | - Xunwu Hu
- Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
| | - Yazhou Zhou
- Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Mebrouka Boubeche
- Songshan Lake Materials Laboratory, University Innovation Town, Building A1, Dongguan, Guang Dong, 523808, China
| | - Ruixin Guo
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- International Quantum Academy, Shenzhen, 518048, China
| | - Yang Liu
- School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Si-Chun Luo
- School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Shu Guo
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- International Quantum Academy, Shenzhen, 518048, China
| | - Kuan Li
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, 510275, China
| | - Peifeng Yu
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, 510275, China
| | - Chao Zhang
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, 510275, China
| | - Wei-Ming Guo
- School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Liling Sun
- Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Dao-Xin Yao
- Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou, 510275, China
- International Quantum Academy, Shenzhen, 518048, China
| | - Huixia Luo
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, 510275, China
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