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 Büchner^1,2, Vamshi Katukuri³, Beom Hyun Kim⁵, Dmitry Efremov³, Jeroen van den Brink³, Marco Moretti⁴, Michael Krisch⁴, and Jochen Geck¹ — ¹Institute 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.