Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 45: Computational Magnetism
MA 45.8: Talk
Friday, March 21, 2025, 11:30–11:45, H18
Mean-Field Approximation and ab-initio calculations in Tetragonal Mn2-based Heusler compounds. — •Jorge Cardenas-Gamboa1,5, Arthur Ernst2, Maia G Vergniory3,4, Edouard Lesne1, Claudia Felser1, and Paul McClarty6 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Johannes Kepler University of Linz, Linz, Austria. — 3Donostia International Physics Center, Donostia-San Sebastian,Spain — 4Université de Sherbrooke, Sherbrooke J1K 2R1 QC, Canada. — 5Leibniz Institute for Solid State and Materials Research, Dresden, Germany — 6Universite Paris-Saclay, Gif-sur-Yvette, France.
Achieving flexible control over magnetic properties is possible in multicomponent systems consisting of several magnetic sublattices with competing interactions.In 2014, Meshcheriakova et al. demonstrated that the Heusler compound Mn2RhSn exhibits substantial strong noncollinearity and its magnetic structure undergoes a spin-reorientation transition, driven by the competition between its magnetic sublattices. In this work, we use a mean-field approximation to analyze the exchange interactions between the sublattices and investigate how different magnetic regimes develop as a function of temperature. Additionally, we perform first-principles calculations to derive the exchange interactions and assess their influence on the magnetic properties, extending our analysis to other tetragonal Heusler magnets. We then explore the topological properties that arise from the magnetism, focusing on the Weyl nodes and surface states.
Keywords: Heusler magnet; Non-collinear; Magnetism