Fermi level tuning and double-dome superconductivity in the kagome metal CsV3Sb5–xSnx

Oey, Yuzki M.; Ortiz, Brenden R.; Kaboudvand, Farnaz; Frassineti, Jonathan; Garcia, Erick; Cong, Rong; Sanna, Samuele; Mitrović, Vesna F.; Seshadri, Ram; Wilson, Stephen D.

doi:10.1103/physrevmaterials.6.l041801

Fermi level tuning and double-dome superconductivity in the kagome metal CsV3 Sb 5–x Snx

Journal Article · Wed Apr 06 00:00:00 EDT 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.l041801· OSTI ID:1982847

^[1]; ^[1]; ^[1]; ^[2]; Garcia, Erick ^[3]; Cong, Rong ^[3]; ^[4]; ^[3]; ^[1]; ^[1]

Univ. of California, Santa Barbara, CA (United States)
Brown Univ., Providence, RI (United States); Univ. of Bologna (Italy)
Brown Univ., Providence, RI (United States)
Univ. of Bologna (Italy)

The recently reported AV₃Sb₅ (A = K , Rb, Cs) family of kagome metals are candidates for unconventional superconductivity and chiral charge density wave (CDW) order; both potentially arise from nested saddle points in their band structures close to the Fermi energy. Here, we use chemical substitution to introduce holes into CsV₃Sb₅ and unveil an unconventional coupling of the CDW and superconducting states. Specifically, we generate a phase diagram for CsV₃Sb_{5 – x}Sn_x that illustrates the impact of hole doping the system and lifting the nearest van Hove singularity toward and above E_F. Superconductivity exhibits a nonmonotonic evolution with the introduction of holes, resulting in two “domes” peaked at 3.6 and 4.1 K and the rapid suppression of three-dimensional CDW order. Further, the evolution of CDW and superconducting order is compared with the evolution of the electronic band structure of CsV₃Sb_{5 – x}Sn_x, where the complete suppression of superconductivity seemingly coincides with an electronlike band comprised of Sb p_z orbitals pushed above E_F.

View Accepted Manuscript (DOE)

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). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1982847

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 4 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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