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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.24: Poster

Wednesday, March 14, 2018, 15:00–19:00, Poster B

RIXS on the j = 1/2 double perovskite Ba2CeIrO6 — •Chin Chyi Loo1, Alessandro Revelli1, Anna Efimenko2, Marco Moretti Sala2, Giulio Monaco3, Thomas Koethe1, Petra Becker4, Ladislav Bohatý4, Paul H. M. van Loosdrecht1, and Markus Grüninger11II, Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany — 2ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France — 3Physics Department, University of Trento, Via Sommarive 14, 38123 Povo (TN), Italy — 4Institute of Geology and Mineralogy, Section Crystallography, University of Cologne, Köln, Germany

Spin-orbit-entangled j=1/2 iridates were predicted to show novel quantum states of matter. However, real materials deviate from a pure j=1/2 state due to, e.g., a non-cubic crystal field. Resonant inelastic x-ray scattering (RIXS) at the Ir L edge is ideally suited to study the j = 1/2 character and to determine the non-cubic crystal field. In the double perovskite Ba2CeIrO6, the Ir ions form an fcc lattice and the local symmetry is close to cubic, with a monoclinic angle β = 89,986 [1]. The RIXS spectra establish the local j =1/2 ground state as well as a crystal-field splitting of the excited j = 3/2 state of less than 100 meV, the smallest observed thus far in iridates.
M. Wakeshima, D. Harada, Y. Hinatsu, J. Mater. Chem. 10 (2000) 419.

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