Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Focus Session: Chiral phonons and crystals coupled to magnetic order II
MA 40.2: Vortrag
Donnerstag, 12. März 2026, 10:00–10:15, HSZ/0002
The effect of lattice vibrations on the Curie temperature — •Thorben Pürling1,2,3 and Stefan Blügel1,2 — 1Peter Grünberg Institut, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Institute for Theoretical Physics, RWTH Aachen University, 52074 Aachen, Germany — 3Science Institute and Faculty of Physical Sciences, University of Iceland, 107 Reykjavík, Iceland
Lattice vibrations, or phonons, are important degrees of freedom that are excited in every magnet operating at finite temperatures. This is particularly true for magnets used in practical applications, which typically operate above room temperature. When predicting critical temperatures – a key property of magnets – from ab initio calculations lattice vibrations are typically neglected in favor of fluctuations only in the magnetic degrees of freedom. Conversely, in experiments at room temperature the lattice does contribute to the thermal properties of the system. We aim to close the gap between theory and experiment at room temperature by taking lattice vibrations into account explicitly. We present a numerical method based on the atomistic spin model and showcase how the lattice vibrations can be integrated out to an effective spin Hamiltonian that inherently depends on lattice fluctuations.
We acknowledge funding from the ERC grant 856538 (project "3D MAGIC") and DFG through SFB-1238 (project C1).
Keywords: atomistic spin-lattice dynamics; critical temperature; spin-lattice coupling; spin-lattice coupled exchange; ferromagnetism