Tiny Sc Allows the Chains to Rattle: Impact of Lu and Y Doping on the Charge Density Wave in ScV6Sn6

ORAL

Abstract

Kagome metals have revealed exciting and unexpected physics in recent years. For example, the RV6Sn6 compounds of the HfGe6Ge6 family show interesting electronic states and magnetism. Surprisingly, only the scandium version of these rare earth materials (ScV6Sn6) develops a charge density wave (CDW) at low temperature.[1] We use careful crystallography and chemical tuning with Lu and Y doping to answer what makes ScV6Sn6 special. Our results reveal that the small size of the Sc atom leaves room for Sn and Sc atoms to rattle and ultimately displace to form the CDW modulation. This not only address why only ScV6Sn6 develop charge order but also provides an unusual variation on the common correspondence between physical and chemical pressure.[2]

[1] H. W. S. Arachchige, et al. Phys. Rev. Lett. 129, 216402 (2022) https://doi.org/10.1103/PhysRevLett.129.216402

[2] W. R. Meier, et al. J. Am. Chem. Soc. 145 (38), 20943 (2023) https://doi.org/10.1021/jacs.3c06394

* M.A.M. and D.M. acknowledge support from the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division. W.R.M., H.W.S.A., C.L.A., and J.D. acknowledge support from the Gordon and Betty Moore Foundation's EPiQS Initiative, Grant GBMF9069 to D.M. S.M. and R.P.M. acknowledge the support from AFOSR MURI (Novel Light–Matter Interactions in Topologically Non-Trivial Weyl Semimetal Structures and Systems) grant# FA9550-20-1-0322. M.M. and H.B.C. were supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract DE-AC05-00OR22725. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-2128556 and the State of Florida.

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Publication: W. R. Meier, et al. J. Am. Chem. Soc. 145 (38), 20943 (2023) https://doi.org/10.1021/jacs.3c06394

Presenters

  • William R Meier

    University of Tennessee, Knoxville

Authors

  • William R Meier

    University of Tennessee, Knoxville

  • Richa Madhogaria

    University of Tennessee, University of Tennessee, Knoxville

  • Shirin Mozaffari

    University of Tennessee, Knoxville

  • Madalynn Marshall

    Oak Ridge National Lab

  • David E Graf

    Florida State University, National High Magnetic Fields Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University

  • Michael A McGuire

    Oak Ridge National Lab

  • Hasitha W Arachchige

    University of Tennessee, Knoxville

  • Caleb L Allen

    University of Tennessee, Knoxville

  • Jeremy Driver

    University of Tennessee, Knoxville

  • Huibo Cao

    Oak Ridge National Laboratory

  • David Mandrus

    University of Tennessee