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Mapping the fermiology of a triangular lattice antiferromagnet

ORAL

Abstract

In this talk, we will present a study on single crystals of a triangular lattice antiferromagnet using quantum oscillation measurements, ARPES, and first-principles calculations. Shubnikov-de Haas and de Haas-van Alphen oscillations were observed in the polarized ferromagnetic state. The analysis of the quantum oscillations suggests three distinct spin-split frequency branches with small effective masses. A comparison between angle-dependent oscillation data, first-principles calculations performed in the ferromagnetic state and ARPES shows good agreement, identifying the hourglass hole pockets and tube hole pockets at the Brillouin zone center, as well as diamond electron pockets at the zone boundary. Fermi surface calculations for both ferromagnetic and simple antiferromagnetic states indicate no substantial differences, and no band inversion is detected near the Fermi level.

Acknowledgement: N. N. thanks Prof. Igor I. Mazin for the fruitful discussion. Work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0021117. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. The computational work was supported by the DOE-BES grant DE-SC0024987 to A. N. A., and used the Hoffman2 Shared Cluster provided by UCLA Office of Advanced Research Computing's Research Technology Group.

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Presenters

  • Jay Green

    UCLA, University of California, Los Angeles

Authors

  • Jay Green

    UCLA, University of California, Los Angeles

  • Harry Morgan

    UCLA

  • Morgaine I Mandigo-Stoba

    University of California, Los Angeles

  • William Laderer

    University of California, Los Angeles, UCLA

  • Christopher Jozwiak

    ALS, LBNL, Berkeley, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, E.O. Lawerence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Aaron Bostwick

    ALS, LBNL, Berkeley, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, LBNL, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Eli Rotenberg

    ALS, LBNL, Berkeley, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Christopher Gutiérrez

    University of California, Los Angeles, University of California Los Angeles

  • Anastassia Alexandrova

    University of California, Los Angeles, UCLA

  • Ni Ni

    University of California, Los Angeles