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Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Magnetic Materials III

MA 19.4: Vortrag

Dienstag, 8. März 2016, 12:15–12:30, H31

Resonant inelastic x-ray scattering of magnetic excitations in the novel 5d4 iridate Ba2YIrO6 — •Maximilian Kusch1, Tusharkanti Dey1, Andrey Malyuk1, Sabine Wurmehl1, Bernd Büchner1,2, Vamshi Katukuri3, Beom Hyun Kim5, Dmitry Efremov3, Jeroen van den Brink3, Marco Moretti4, Michael Krisch4, and Jochen Geck11Institute for Solid State and Materials Research, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Institut für Festkörperphysik, Technische Universität Dresden D-01062 Dresden, Germany — 3Institute for Theoretical Solid State State Physics, IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 4European Synchrotron Radiation Facility, B.P.220, 38043 Grenoble, France — 5Pohang university of science and technology

Ba2YIrO6 is a realization of a Ir-5d4 electronic configuration forming a J=0 ground state. Recently they gained particular interest since theoretical studies proposed, that a new type of van-Vleck like paramagnetism including excitation of non-zero J (J = 1, 2) might play an important role [khaliullin2013]. Our theoretical model calculations of the momentum dependence of these excitations predict a considerable dispersion of the J=1 and J=2 excitations and, in dependence on model parameters, a dramatic softening of excitations is observed. We performed high-resolution resonant inelastic x-ray scattering (RIXS) studies on Ba2YIrO6 to determine these dispersions experimentally. The results of these measurements are presented and discussed in comparison to the model calculations.

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