Speaker
Description
Using symmetry analysis, first-principles density functional theory and spin dynamics, we pinpoint the origin of the diffuse neutron scattering observed in hexagonal yttrium manganite (h-YMnO$_3$). h-YMnO$_3$ is a prototype system for studying frustrated magnetism, due to its dominant first nearest-neighbor anti-ferromagnetic coupling on a triangular lattice. We argue that thermal fluctuations departing from the ground state 120º spin configuration - a scenario ruled out in previous modelling attempts - give rise to short-range correlations. Though a hierarchy of nearest-neighbor exchanges and magnetic anisotropy terms, clusters of ordered spins form and interact with each other, creating excitations. Moreover, we simulate the formation of planar and vertical magnetic domains.
| Theoretical Work | Theory |
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