Oral: Anomalous angular magnetoresistance of a proposed type-II Weyl semimetal CeAlGe

ORAL

Abstract

CeAlGe, a proposed type-II Weyl semimetal, orders antiferromagnetically below 5 K in a zero magnetic field. In the magnetically ordered state, the magnetic moment lies in the tetragonal ab plane, and the M(H) data show a four-fold symmetry along the principal directions in the ab plane. However, anomalously robust and complex two-fold symmetry is observed in the angular dependence of resistivity and magnetic torque data in the magnetically ordered state if the field is swept in the ab plane. This two-fold symmetry is independent of temperature and field-hystereses. We will show that this anomalous behavior is the result of complex magnetic structures and can be tuned by an Al deficiency.

* Materials synthesis efforts were supported by the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF9071, and experimental investigations were supported by the Department of Energy, Office of Basic Energy Sciences, under Award No. DE-SC0019154

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Publication: 1. H. Hodovanets, C. J. Eckberg, P. Y. Zavalij, H. Kim, W.-C. Lin, M. Zic, D. J. Campbell, J. S. Higgins, and J. Paglione, Single-crystal investigation of the proposed type-II Weyl semimetal CeAlGe, Phys. Rev. B 98, 245132 (2018).
2. H. Hodovanets, C. J. Eckberg, D. J. Campbell, Y. Eo, P. Y. Zavalij, P. Piccoli, T. Metz, H. Kim, J. S. Higgins, and J. Paglione, Anomalous symmetry breaking in the Weyl semimetal CeAlGe, Phys. Rev. B 106, 235102 (2022).

Presenters

  • Halyna Hodovanets

    Missouri University of Science and Technology, Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

Authors

  • Halyna Hodovanets

    Missouri University of Science and Technology, Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • C. J Eckberg

    Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • D. J Campbell

    Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • Y. Eo

    Texas Tech University, Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • P. Y Zavalij

    University of Maryland, College Park, X-ray Crystallographic Center, Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 2074, USA

  • P. M Piccoli

    Department of Geology, University of Maryland, College Park, Maryland 20742, USA

  • Tristin E Metz

    Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA, University of Maryland, College Park

  • Hyunsoo Kim

    Missouri University of Science & Technology, Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA, Missouri S and T

  • J. S Higgins

    Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

  • Johnpierre Paglione

    University of Maryland, College Park, Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA