Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Computational Magnetism 2

MA 15.8: Talk

Tuesday, September 6, 2022, 11:15–11:30, H48

The Complex Magnetic Structure and Giant Topological Hall Conductivity in Kagome Metal YnMn₆Sn₆ — •Hao Wang¹, Stefan Blügel¹, and Yuriy Mokrousov^1,2 — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich, Germany — ²Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany.

The discovery of topological Kagome magnets attracts enormous research interest in recent years. The typical band structure of a Kagome lattice includes a flat band and a Dirac point. The high localized electrons induced strong many-body interactions in the flat bands and the linear dispersion of the Dirac point could lead to many intriguing physical phenomena, such as the quantum anomalous Hall effects, superconductivity, and the non-Fermi liquid behavior. Furthermore, the relationship between the complex noncolinear magnetic structures and band topology of the Kagome magnets also deserves further exploration. In this work, using first-principles calculation and spin Hamiltonian analysis, we investigated the complex magnetic structures, phase transition, and topological Hall conductivity of the Kagome metal YMn6Sn6. We confirm that the ground state of this material is a double flat-spiral structure, and we demonstrate the important role of thermal fluctuation in the origin of the giant Hall conductivity. This work provides a platform to understand the complex magnetic structure and topological properties of Kagome magnets for future spintronic devices.