Fermi Surface Mapping and the Nature of Charge-Density-Wave Order in the Kagome Superconductor CsV3Sb5

Brenden R. Ortiz, Samuel M.L. Teicher, Linus Kautzsch, Paul M. Sarte, Noah Ratcliff, John Harter, Jacob P.C. Ruff, Ram Seshadri, Stephen D. Wilson

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Abstract

The recently discovered family of AV3Sb5 (A: K, Rb Cs) kagome metals possess a unique combination of nontrivial band topology, superconducting ground states, and signatures of electron correlations manifest via competing charge density wave order. Little is understood regarding the nature of the charge density wave (CDW) instability inherent to these compounds and the potential correlation with the onset of a large anomalous Hall response. To understand the impact of the CDW order on the electronic structure in these systems, we present quantum oscillation measurements on single crystals of CsV3Sb5. Our data provide direct evidence that the CDW invokes a substantial reconstruction of the Fermi surface pockets associated with the vanadium orbitals and the kagome lattice framework. In conjunction with density functional theory modeling, we are able to identify split oscillation frequencies originating from reconstructed pockets built from vanadium orbitals and Dirac-like bands. Complementary diffraction measurements are further able to demonstrate that the CDW instability has a correlated phasing of distortions between neighboring V3Sb5 planes, and the average structure in the CDW state is proposed. These results provide critical insights into the underlying CDW instability in AV3Sb5 kagome metals and support minimal models of CDW order arising from within the vanadium-based kagome lattice.

Original languageEnglish
Article number041030
JournalPhysical Review X
Volume11
Issue number4
DOIs
StatePublished - Dec 2021
Externally publishedYes

Funding

S. W. gratefully acknowledges discussions with Leon Balents, Binghai Yan, and Ziqiang Wang. We gratefully thank Matthew Benning and Michael Ruf of Bruker Corporation for their assistance in the integration of synchrotron data with Apex3 and their crystallography discussions. 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). This research made use of the shared facilities of the NSF Materials Research Science and Engineering Center at UC Santa Barbara (DMR-1720256). The UC Santa Barbara MRSEC is a member of the Materials Research Facilities Network. B. R. O. and P. M. S. also acknowledge support from the California NanoSystems Institute through the Elings Fellowship program. S. M. L. T. was supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1650114. This work is based upon research conducted at the Center for High Energy X-ray Sciences (CHEXS), which is supported by the National Science Foundation under Grant No. DMR-1829070. We acknowledge use of the shared computing facilities of the Center for Scientific Computing at UC Santa Barbara, supported by NSF CNS-1725797.

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