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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Frustrated Magnets - Strong Spin-Orbit Coupling (joint session TT/MA)

TT 53.2: Vortrag

Donnerstag, 4. April 2019, 09:45–10:00, Theater

Fingerprints of Kitaev physics in RIXS on Na2IrO3 and α-Li2IrO3 — •Alessandro Revelli1, Marco Moretti Sala2, Giulio Monaco3, Maria Hermanns4, Petra Becker5, Ladislav Bohatý5, Friedrich Freund6, Anton Jesche6, Philipp Gegenwart6, Paul van Loosdrecht1, Jeroen van den Brink7, and Markus Grüninger11II. Physikalisches Institut, Universität zu Köln, Germany — 2ESRF, Grenoble, France — 3Universitá di Trento, Italy — 4Stockholm University, Sweden — 5Abt. Kristallographie, Institut fur Geologie und Mineralogie, Universität zu Köln, Germany — 6Experimentalphysik VI, Universität Augsburg, Germany — 7IFW Dresden, Germany

The honeycomb iridates Na2IrO3 and α-Li2IrO3 are discussed as candidate materials for hosting Kitaev physics. We study the magnetic excitations in these compounds by resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge, searching for experimental fingerprints of Kitaev physics. In both compounds, we find a broad continuum of excitations centered at q=0. This continuum survives up to 300 K, roughly 20 times the magnetic ordering temperature. The dynamical structure factor shows that spin-spin correlations are restricted to nearest neighbors, a characteristic property of the Kitaev model. Also the polarisation dependence agrees with an interpretation in terms of bond-directional Kitaev exchange interactions.

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