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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 3 (jointly with MA)

TT 30.14: Vortrag

Dienstag, 17. März 2015, 13:00–13:15, H 0110

Resonant inelastic x-ray scattering of magnetic excitations in the novel 5d4 iridate Ba2YIrO6 — •Maximilian Kusch1,2, T. Dey1, A. Maljuk1, S. Wurmehl1, B. Büchner1,2, V. M. Katakuri3, B. H. Kim3, D. V. Efremov3, J. van den Brink3, M. Moretti4, M. Krisch4, and J. Geck11Institute for Solid State and Materials Research, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Institut für Festkörperphysik, Technische Universität D-01062 Dresden, Germany — 3Institute for Theoretical Solid State State Physics, IFW Dresden, Germany — 4ESRF, B.P.220, 38043 Grenoble, France

In contrast to the much studied 5d5 iridates with a spin-orbit coupled J=1/2 ground state, Ba2YIrO6 is a realization of a Ir-5d4 system. For this case, a ground state J=0 is expected, i.e, Ba2YIrO6 should be non-magnetic. Surprisingly, our measurements of the magnetic susceptibility reveal sizable magnetic moments whose microscopic origin is still unclear. Theoretical studies indicate the important role of low-lying magnetic excitations, thereby providing a possible explanation for the unexpected magnetic susceptibility [Khaliullin Phys. Rev. Lett. 111 (2013)]. In addition, our theoretical models predict a considerable dispersion of the J=1 and J=2 excitations in Ba2YIrO6. To elucidate the unconventional magnetism of Ba2YIrO6 and to determine the dispersions of the J=1 and J=2 excitations experimentally, we performed RIXS studies of this novel 5d4 compound. Here we present the results, focusing on the magnetic dispersions in a large region of q-space in comparison to our model calculations.

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