Tuning charge density wave order and superconductivity in the kagome metals KV 3 Sb 5 – x Sn x and RbV 3 Sb 5 – x Sn x

Journal Article · 13 July 2022 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.6.074802 · OSTI ID:1982841

Oey, Yuzki M.  ^[1]; Kaboudvand, Farnaz ^[1]; Ortiz, Brenden R. ^[1]; Seshadri, Ram ^[1]; Wilson, Stephen D.  ^[1]

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1. Univ. of California, Santa Barbara, CA (United States)

The family of AV₃Sb₅ (A = K, Rb, Cs) kagome metals exhibits charge density wave (CDW) order, proposed to be chiral, followed by a lower temperature superconducting state. Recent studies have proposed the importance of band structure saddle points proximal to the Fermi energy in governing these two transitions. Here we show the effects of hole doping achieved via chemical substitution of Sn for Sb on the CDW and superconducting states in both KV₃Sb₅ and RbV₃Sb₅ and generate a phase diagram. Furthermore, hole doping lifts the Γ pocket and van Hove singularities toward E_F causing the superconducting T_C in both systems to increase to about 4.5 K, while rapidly suppressing the CDW state.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1982841
• Journal Information: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 7 Vol. 6; ISSN 2475-9953
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English