Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.24: Poster

Mittwoch, 14. März 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 Grüninger¹ — ¹II, 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.