Doping evolution of superconductivity, charge order, and band topology in hole-doped topological kagome superconductors Cs(V1−xTix)3Sb5
Yixuan Liu, Yuan Wang, Yongqing Cai, Zhanyang Hao, Xiao-Ming Ma, Le Wang, Cai Liu, Jian Chen, Liang Zhou, Jinhua Wang, Shanmin Wang, Hongtao He, Yi Liu, Shengtao Cui, Bing Huang, Jianfeng Wang, Chaoyu Chen, Jia-Wei Mei
DOI 10.1103/PhysRevMaterials.7.064801 · Physical Review Materials
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Abstract
The newly discovered kagome superconductors AV3Sb5 (A=K, Rb, Cs) exhibit superconductivity, charge order, and band topology simultaneously. To explore the intricate interplay between the superconducting and charge-density-wave (CDW) orders, we investigate the doping evolution of underlying electronic structures in doped topological kagome superconductors Cs(V1−xTix)3Sb5 where the Ti dopant introduces hole-like charge carriers. Despite the absence of the CDW phase transition in doped compounds even for the lowest doping level of x=0.047, the superconductivity survives in all doped samples with enhanced critical temperatures. The high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements reveal that the Ti dopant in the kagome plane lowers the chemical potential, pushing the van Hove singularity (VHS) at M point above the Fermi level. First-principle simulations corroborate the doping evolution of the band structure observed in ARPES, and affirm that the CDW instability does not occur once the VHS moves above the Fermi level, explaining the absence of the CDW ordering in our doped samples Cs(V1−xTix)3Sb5. Our results also demonstrate a competition between the CDW and superconducting orders in the kagome-metal superconductor CsV3Sb5, although the superconductivity is likely inconsequential of the CDW order.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Cs(V1-xTix)3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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