Spin-orbital frustration in Mott insulators
Jeudi 18 mai 2017 11:00
- Duree : 1 heure
Lieu : Science Building seminar room SB036, ILL - 71 avenue des Martyrs - Grenoble
Orateur : George JACKELI (MPI-FKF and Uni. Stuttgart)
In Mott insulators, unquenched orbital degrees of freedom often frustrate the magnetic interactions and lead to a plethora of interesting phases with unusual spin patterns or non-magnetic states without long-range order. I will review from this perspective the theoretical concepts and experimental data on late transition metal compounds, mostly focusing on iridates. In the second part, I will present our recent theoretical study of interplay of spin and orbital degrees in double-perovskite compounds with spin one-half ions occupying the frustrated fcc sublattice, such as molybdenum and osmium oxides.
I will argue that this interplay might lead to a rich variety of the phases that include non-collinear ordered patterns with or without net moment, and, most remarkably, non-magnetic disordered spin-orbit dimer state.
Contact : mader@ill.fr
Discipline évènement : (Physique)
Entité organisatrice : (ILL)
Nature évènement : (Séminaire)
Site de l'évènement : Polygone scientifique
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