Vanadium-based superconductivity in the breathing kagome compound Ta2V3.1Si0.9
HongXiong Liu, JingYu Yao, JianMin Shi, ZhiLong Yang, DaYu Yan, Yong Li, DaiHong Chen, Hai L. Feng, ShiLiang Li, ZhiJun Wang, YouGuo Shi
DOI 10.1103/PhysRevB.108.104504 · Physical Review B
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Abstract
Superconductivity in V-based kagome metals has recently raised great interest as they exhibit the competing ground states associated with the flat bands and topological electronic structures. Here we report the discovery of superconductivity in Ta2V3.1Si0.9 with a superconducting transition temperature Tc of 7.5 K, a record high for kagome metals at ambient pressure. While the V ions form a two-dimensional breathing kagome structure, the length difference between two different V-V bonds is just 0.05Å, making it very close to the perfect kagome structure. Our results show that Ta2V3.1Si0.9 is a moderate-coupled type-II superconductor with a large upper critical field that is close to the Pauli limit. DFT calculations give a Van Hove singularity band located at Fermi energy, which may explain the relatively high Tc observed in this material. Furthermore, electron-phonon coupling calculations indicate that the in-plane vibrations of the V atoms play a significant role in driving the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta2V3.1Si0.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.5 | Pressure unresolved | onset |
| Ta2V3.1Si0.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.1 | Pressure unresolved | midpoint |
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.93 | Pressure not reported | unknown |
| RbV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.92 | Pressure not reported | unknown |
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
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