Doping evolution of superconductivity, charge order, and band topology in hole-doped topological kagome superconductors Cs(V1-xTix)3Sb5

Liu，Yixuan1,2; Wang，Yuan1,2; Cai，Yongqing1,2; Hao，Zhanyang1,2; Ma，Xiao Ming1,2; Wang，Le1,2; Liu，Cai1,2; Chen，Jian1; Zhou，Liang1; Wang，Jinhua1; Wang，Shanmin1; He，Hongtao1; Liu，Yi3; Cui，Shengtao3; Huang，Bing4; Wang，Jianfeng4,5; Chen，Chaoyu1,2; Mei，Jia Wei1,2,6

2023-06-01

10.1103/PhysRevMaterials.7.064801

Physical Review Materials   Impact Factor & Quartile

2475-9953

2475-9953

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.

SCI

English

First

National Key Re-search and Development Program of China[2021YFA1400400] ; Shenzhen Fundamental Research Pro-gram[JCYJ20220818100405013] ; National Nat-ural Science Foundation of China (NSFC)["12074163","12004030"] ; Shenzhen High-level Special Fund["G02206304","G02206404"] ; Guangdong Innovative and Entrepreneurial Research Team Program["2017ZT07C062","2019ZT08C044"] ; Shenzhen Science and Technology Pro-gram[KQTD20190929173815000] ; Univer-sity Innovative Team in Guangdong Province[2020KCXTD001] ; Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices[ZDSYS20190902092905285] ; Guangdong Basic and Applied Basic Research Foundation[2020B1515120100] ; China Postdoctoral Science Foundation[2020M682780]

Materials Science

Materials Science, Multidisciplinary

WOS:001009433400001

AMER PHYSICAL SOC

2-s2.0-85161836645

Scopus

1.Shenzhen Institute for Quantum Science and Engineering,Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.International Quantum Academy,Shenzhen Branch,Hefei National Laboratory,Shenzhen,Futian District,518048,China
3.National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei,230029,China
4.Beijing Computational Science Research Center,Beijing,100193,China
5.School of Physics,Beihang University,Beijing,100191,China
6.Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Yixuan,Wang，Yuan,Cai，Yongqing,et al. Doping evolution of superconductivity, charge order, and band topology in hole-doped topological kagome superconductors Cs(V1-xTix)3Sb5[J]. Physical Review Materials,2023,7(6).

Liu，Yixuan.,Wang，Yuan.,Cai，Yongqing.,Hao，Zhanyang.,Ma，Xiao Ming.,...&Mei，Jia Wei.(2023).Doping evolution of superconductivity, charge order, and band topology in hole-doped topological kagome superconductors Cs(V1-xTix)3Sb5.Physical Review Materials,7(6).

Liu，Yixuan,et al."Doping evolution of superconductivity, charge order, and band topology in hole-doped topological kagome superconductors Cs(V1-xTix)3Sb5".Physical Review Materials 7.6(2023).