Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Electrons: Frustrated Magnets - General 2
TT 72.1: Vortrag
Donnerstag, 23. März 2017, 15:00–15:15, HSZ 204
The role of nonmagnetic d0 vs d10 B-type cations on the magnetic exchange interactions in osmium double perovskites — •Hai Feng1, Kazunari Yamaura2, Martin Jansen3, and Liu Hao Tjeng1 — 1Max Planck Institute for Chemical Physics of Solids — 2National Institute for Materials Science — 3Max Planck Institute for Solid State Research
Double perovskite oxides, A2BB'O6, containing 4d/5d elements have attracted considerable attention due to their remarkable electronic and magnetic properties, such as room-temperature magnetoresistance and high-temperature ferrimagnetism. In this talk, we will present our studies on the magnetic properties of osmium double perovskite oxides Ba2BOsO6 (B = Sc, Y, In). Ba2BOsO6 (B = Sc, Y, In) adopt the cubic double perovskite structures (space group, Fm-3m) with ordered B and Os arrangements and show antiferromagnetic transitions at 93 K, 69 K, and 28 K, respectively. The Weiss-temperatures are -590 K for Ba2ScOsO6, -571 K for Ba2YOsO6, and -155 K for Ba2InOsO6. Sc3+ and Y3+ have the open-shell d0 electronic configuration, while In3+ has the closed-shell d10. This indicates that a d0 B-type cation induces stronger overall magnetic exchange interactions in comparison to a d10. Comparison of Ba2BOsO6 (B = Sc, Y, In) to their Sr and Ca analogues shows that the structural distortions weaken the overall magnetic exchange interactions.