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AV3Sb5 kagome superconductors

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Abstract

The recent discovery of the AV3Sb5 (A = K, Rb, Cs) kagome superconductors launched a growing field of research investigating the interplay between superconductivity and charge-density wave order in kagome metals. Specifically, the AV3Sb5 family of materials naturally exhibits a Fermi level close to the Van Hove singularities associated with the saddle points formed from the prototypical kagome band structure. The charge-density wave and superconducting states that form within the kagome networks of these compounds exhibit a number of anomalous properties reminiscent of theoretical predictions of exotic states in kagome metals tuned close to their Van Hove fillings. In this Review, we discuss the key structural and electronic features of AV3Sb5 compounds and survey the status of investigations of their unconventional electronic phase transitions.

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Fig. 1: Crystal and electronic band structures of AV3Sb5 compounds.
Fig. 2: Elements of charge-density wave order in AV3Sb5 compounds.
Fig. 3: Intermediate electronic phase transitions and crossovers in AV3Sb5.
Fig. 4: Momentum-space contours of the Fermi surface and the corresponding nesting wave vectors for electronic order.
Fig. 5: Phase diagrams of AV3Sb5 compounds tuned by pressure and doping.
Fig. 6: Sublattice doping of CsV3Sb5 with various electronic, magnetic and isoelectronic dopants.

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Acknowledgements

S.D.W. gratefully acknowledges support from the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i programme under award DMR-1906325 and the Eddleman Center for Quantum Innovation. B.R.O. gratefully acknowledges support from the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Notice: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

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  1. Materials Department, University of California Santa Barbara, Santa Barbara, CA, USA

    Stephen D. Wilson

  2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

    Brenden R. Ortiz

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Wilson, S.D., Ortiz, B.R. AV3Sb5 kagome superconductors. Nat Rev Mater (2024). https://doi.org/10.1038/s41578-024-00677-y

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