Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.26: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Influence of the mixed-valence state of Ir on the structural properties of Ba3MIr2O9 (M= In, Lu, Mg) — •Georg Bothmann1, Tusharkanti Dey1, Anatoliy Senyshyn2, Philipp Gegenwart1, and Alexander Tsirlin1 — 1Lehrstuhl für Experimentalphysik VI, Zentrum für Elektronische Korrelationen und Magnetismus, Univesität Augsburg, Deutschland — 2FRM-II, Technische Universität München, Deutschland
Mixed-valence iridates are a new platform for frustrated magnetism as shown in [1]. It is suspected that the mixed-valence state may evolve with temperature. Here we used x-ray diffraction (using radiation from a synchrotron) and neutron powder diffraction in a broad temperature range to compare the mixed-valence In and Lu compounds of the Ba3MIr2O9 family of hexagonal perovskites with the integer-valence Mg compound of the same family.
The temperature dependence of the structural parameters, including lattice constants and Ir-Ir distances, will be reported. Additionally the instability toward a monoclinic distortion will be discussed.
T. Dey, Phys. Rev. B 96 (2017) 174411