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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.7: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Quasi-molecular electronic structure of the spin-liquid candidate Ba₃InIr₂O₉ revealed by RIXS — Alessandro Revelli¹, •Marco Magnaterra¹, Marco Moretti Sala², Giulio Monaco³, Jan Attig⁴, Alexander Tsirlin⁵, Tusharkanti Dey^1,5, Philipp Gegenwart⁵, Tobias Fröhlich¹, Petra Becker⁶, Maria Hermanns⁷, Paul H. M. van Loosdrecht¹, Daniel I. Khomskii¹, Jeroen van den Brink⁸, and Markus Grüninger¹ — ¹II. Physikalisches Inst., Universität zu Köln — ²Dip. di Fisica, Politecnico di Milano, Italy — ³Dip. di Fisica, Università di Trento, Italy — ⁴Inst. fur Theoretische Physik, Universität zu Köln — ⁵Experimental Physics VI, University of Augsburg — ⁶Abt. Kristallographie, Inst. fur Geologie und Mineralogie, Universitat zu Köln — ⁷Dep. of Physics, Stockholm University, Sweden — ⁸Inst. for Theoretical Solid State Physics, IFW Dresden

We address the electronic structure of the mixed-valent iridate Ba₃InIr₂O₉ by means of resonant inelastic x-ray scattering (RIXS). Previously, it has been discussed as a promising candidate for quantum spin-liquid behavior [1]. It exhibits Ir^4.5+ ions in face-sharing IrO₆ octahedra forming Ir₂O₉ dimers. RIXS unravels a rich excitation spectrum below about 1.5eV. The observation of a pronounced sinusoidal RIXS interference pattern unambiguously demonstrates the quasi-molecular orbital character of the electronic states. Three t_2g holes are delocalized over a dimer, establishing Ba₃InIr₂O₉ as a cluster Mott insulator with a quasi-molecular j_dim=1/2 ground state.

[1] Dey et al., PRB 96, 174411 (2017).