Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.40: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Accessing the magnetic properties of iridium oxides by means of electron spin resonance — •Stephan Fuchs¹, Giacomo Prando¹, Alexey Alfonsov¹, Vladislav Kataev¹, Bernd Büchner^1,2, Brendan Phelan³, and Robert Cava³ — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany — ²Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany — ³Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA

We report on our first results of electron spin resonance (ESR) measurements performed on exemplary iridium-based oxides. These are aimed at understanding the microscopic magnetic properties of these materials which are ultimately arising from a complex interplay of spin-orbital interactions and strong electronic correlations. La_11−xSr_xIr₄O₂₄ allows us to detect single-iridium ion spectroscopic features thanks to the large distance among iridium-oxygen cages. At the same time, the increased inter-ions interactions in Na₂IrO₃ lead to a clear broadening of the ESR signal. We discuss our preliminary results in a wide range of temperatures and magnetic fields (up to 16 T).