SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.24: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Non-Coplanar Magnetic Orders in Classical Square-Kagome Antiferromagnets — •Martin Gembé¹, Heinz-Jürgen Schmidt², Ciarán Hickey¹, Johannes Richter^3,4, Yasir Iqbal⁵, and Simon Trebst¹ — ¹Institute for Theoretical Physics, University of Cologne, Germany — ²Fachbereich Physik, Universität Osnabrück, Germany — ³Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Germany — ⁴Max-Planck-Institut für Physik Komplexer Systeme, Dresden, Germany — ⁵Department of Physics and Quantum Centers in Diamond and Emerging Materials (QuCenDiEM) group, Indian Institute of Technology Madras, India

Motivated by the recent synthesis of KCu₆AlBiO₄(SO₄)₅Cl, we study the classical Heisenberg model on the square-kagome lattice – also called the squagome or shuriken lattice. This cousin of the kagome lattice exhibits, already on the classical level, a rich phenomenology of frustrated magnetism including residual entropy, order-by-disorder, and non-coplanar ordering tendencies. Having in mind that upon introducing quantum fluctuations, non-coplanar order melts into chiral spin liquids, we explore the multitude of non-coplanar orders including some which break rotational symmetry (possibly leading to nematic quantum orders), for an elementary, classical Heisenberg model on the squagome lattice supplemented by cross-plaquette interations.