Discovery of AV3Sb5 kagome superconductors and CsV3Sb5 Fermi surface mapping

ORAL

Abstract

Since our discovery of the AV3Sb5 (A: K, Rb Cs) family of kagome superconductors, the system has garnered significant attention within the condensed matter physics community, particularly due to the unique combination of nontrivial band topology, superconductivity, and signatures of electron correlations manifest via competing charge density wave order.  Still, little is understood regarding the nature of the charge density wave (CDW) instability inherent to these compounds. 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.  Complementary diffraction measurements are further able to demonstrate that the CDW instability has a correlated phasing of distortions, and the average structure in the CDW state is proposed. 

*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 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. (www.mrfn.org). B.R.O. and P.M.S. also acknowledge support from the California NanoSystems Institute through the Elings Fellowship program. S.M.L.T has been 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 award DMR-1829070.

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Publication: (1) Ortiz, B. R., Gomes, L. C., Morey, J. R., Winiarski, M., Bordelon, M., Mangum, J. S., ... & Toberer, E. S. (2019). New kagome prototype materials: discovery of KV3Sb5, RbV3Sb5, and CsV3Sb5. Physical Review Materials, 3(9), 094407.
(2) Ortiz, B. R., Teicher, S. M., Hu, Y., Zuo, J. L., Sarte, P. M., Schueller, E. C., ... & Wilson, S. D. (2020). CsV3Sb5: A Z2 Topological Kagome Metal with a Superconducting Ground State. Physical Review Letters, 125(24), 247002.
(3) Ortiz, B. R., Sarte, P. M., Kenney, E. M., Graf, M. J., Teicher, S. M., Seshadri, R., & Wilson, S. D. (2021). Superconductivity in the Z 2 kagome metal KV3Sb5. Physical Review Materials, 5(3), 034801.
(4) Ortiz, B. R., Teicher, S. M., Kautzsch, L., Sarte, P. M., Ruff, J. P., Seshadri, R., & Wilson, S. D. (2021). Fermi surface mapping and the nature of charge density wave order in the kagome superconductor CsV3Sb5. arXiv preprint arXiv:2104.07230.

Presenters

  • Brenden Ortiz

    • University of California, Santa Barbara

Authors

  • Brenden Ortiz

    • University of California, Santa Barbara

  • Samuel M Teicher

    • University of California, Santa Barbara

  • Linus Kautzsch

    • University of California Santa Barbara

  • Paul M Sarte

    • University of California, Santa Barbara

  • Noah Ratcliffe

    • University of California, Santa Barbara

  • John W Harter

    • University of California, Santa Barbara

  • Jacob Ruff

    • Cornell University

  • Ram Seshadri

    • University of California, Santa Barbara

  • Stephen D Wilson

    • University of California, Santa Barbara