Regensburg 2019 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 7: Multiferroics
KFM 7.6: Vortrag
Montag, 1. April 2019, 17:10–17:30, H47
Interplay of structural distortions and magnetism in lacunar spinels — •Sergey Artyukhin1, Giulia Biffi1, and István Kézsmárki2 — 1Italian Institute of Technology, Genova, Italy — 2University of Augsburg, Germany
Lacunar spinels contain tetrahedral clusters of transition metal compounds whose molecular orbitals host electrons, delocalized over the cluster. Partial occupations of degenerate molecular orbitals are thought to lead to Jahn-Teller distortions that influence magnetic exchange interactions between clusters, giving rise to a multitude of distortion patterns and magnetic ground states, including non-collinear states and skyrmion lattices. Here we use effective Hamiltonians with parameters derived from ab-initio calculations to address the complex phase diagram of these compounds.