Ta4CoSi: A tantalum-rich superconductor with a honeycomb network structure
Lingyong Zeng, Xunwu Hu, Shu Guo, Gaoting Lin, Jing Song, Kuan Li, Yiyi He, Yanhao Huang, Chao Zhang, Peifeng Yu, Jie Ma, Dao-Xin Yao, Huixia Luo
DOI 10.1103/PhysRevB.106.134501 · Physical Review B
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Abstract
The crystal structure of solid-state materials with unique lattices is considered one of the main factors determining physical properties, including superconductivity. Materials with honeycomb lattices have inspired intense research interest for their novel properties. A previously unknown compound, Ta4CoSi, is discussed herein, along with its crystal structure and superconducting properties. It crystallizes in a CuAl2−type structure (space group P4/mcc, No. 124), with the lattice parameters a=b=6.17755(7)Å and c=4.98443(8)Å, featuring honeycomb networks of Ta-Ta in the (110) plane. Superconductivity is observed below the critical temperature of ∼2.45 K, while lower and upper critical magnetic fields are ∼9.86 mT and 0.84 T, respectively. Experiments and theoretical calculations show that the honeycomb lattices significantly influence the superconducting properties. This material may thus provide a new platform for investigating the exotic superconductivity of honeycomb networks.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.52 | Pressure not reported | onset |
| Ta4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.41 | Pressure not reported | zero_resistance |
| Ta4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.45 | Pressure not reported | midpoint |
| Ta4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.44 | Pressure not reported | onset |
| Ta4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.34 | Pressure not reported | unknown |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.3 | Pressure not reported | unknown |
| Nb4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
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