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Topology and magnetism in twisted Kagome magnets RAgGe

ORAL

Abstract

The Kagome lattice consists of corner-sharing equilaterial triangles that form a prefect hexagonal pattern. Due to its unique geometry, the Kagome lattice is considered to be one of the most frustrated systems, known for hosting both magnetic frustration and electronic topological properties. When these triangles are rotated with respect to each other, a structure called twisted Kagome lattice is formed. This twisted structure, similarly to the original Kagome lattice, consists of a 2D network of corner sharing equilaterial triangles. This twisting reduces symmetry and increases in-plane anisotropy, leading to more complex and unusual physical properties. The RAgGe family of compounds (where R = rare earth element) is an example of such a structure, where R atoms form a twisted Kagome net. These compounds crystallize in the ZrNiAl-type structure within a non-centrosymmetric hexagonal space group. Some intresting physics enabled by the twisted kagome geometry had been realized in one of the members of this family-HoAgGe. Additionally, magnetization plateaus of different nature have been reported for RAgGe compounds with R = Dy- Yb. In terms of electronic structure, these compounds also preserve canonical topological features of the Kagome lattice, such as Dirac points, and quasi-flat bands. In this talk, we will present intriguing magnetic and magnetotransport properties of various RAgGe compounds.

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Presenters

  • Hari Bhandari

    University of Notre Dame, Stavropoulos Center for Complex Quantum Matter, George Mason University, Department of Physics and Astronomy, Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, University of Notre Dame, Department of Physics and Astronomy, University of Notre Dame; Stavropoulos Centre for Complex Quantum Matter, University of Notre Dame

Authors

  • Hari Bhandari

    University of Notre Dame, Stavropoulos Center for Complex Quantum Matter, George Mason University, Department of Physics and Astronomy, Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, University of Notre Dame, Department of Physics and Astronomy, University of Notre Dame; Stavropoulos Centre for Complex Quantum Matter, University of Notre Dame

  • Po-hao Chang

    George Mason University, Department of Physics and Astronomy, George Mason University

  • Sekh Jamaluddin

    Department of Physics and Astronomy, Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, University of Notre Dame, Department of Physics and Astronomy, University of Notre Dame; Stavropoulos Centre for Complex Quantum Matter, University of Notre Dame

  • Resham B Regmi

    University of Notre Dame, Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, Department of Physics and Astronomy, University of Notre Dame; Stavropoulos Centre for Complex Quantum Matter, University of Notre Dame

  • Igor I Mazin

    George Mason University, George Mason University, Quantum Science and Engineering Center, Depertment of Physics and Astronomy, George Mason University; Quantum Science and Engineering Centre, George Mason University

  • Nirmal J Ghimire

    University of Notre Dame, Stavropoulos Center for Complex Quantum Matter, Department of Physics and Astronomy, Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, University of Notre Dame, Department of Physics and Astronomy, University of Notre Dame; Stavropoulos Centre for Complex Quantum Matter, University of Notre Dame