Fermi level tuning and double-dome superconductivity in the kagome metal CsV3 Sb5-x Snx

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

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

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 CsV3Sb5-xSnx that illustrates the impact of hole doping the system and lifting the nearest van Hove singularity toward and above EF. 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. The evolution of CDW and superconducting order is compared with the evolution of the electronic band structure of CsV3Sb5-xSnx, where the complete suppression of superconductivity seemingly coincides with an electronlike band comprised of Sb pz orbitals pushed above EF.

Original languageEnglish
Article numberL041801
JournalPhysical Review Materials
Volume6
Issue number4
DOIs
StatePublished - Apr 2022
Externally publishedYes

Funding

This work was supported by the National Science Foundation (NSF) through Enabling Quantum Leap: Convergent Accelerated Discovery Foundries for Quantum Materials Science, Engineering and Information (Q-AMASE-i): Quantum Foundry at UC Santa Barbara (DMR-1906325). The research reported here made use of shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara DMR-1720256, a member of the Materials Research Facilities Network . Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Y.M.O. is supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1650114. B.R.O. is supported by the California NanoSystems Institute through the Elings Fellowship program. F.K. acknowledges the Roy T. Eddleman Center for Quantum Innovation (ECQI) for their support. Work at Brown University was supported in part by the National Science Foundation Grant No. DMR-1905532.

FundersFunder number
California NanoSystems InstituteDMR-1905532
Materials Science, Engineering and Information
National Science Foundation
U.S. Department of Energy
Office of Science
Basic Energy SciencesDGE-1650114, DE-AC02-06CH11357
University of California, Santa BarbaraDMR-1906325

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