Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Focus Session: Electronic Properties of Spin-Orbit Driven Oxides
TT 56.2: Hauptvortrag
Mittwoch, 2. April 2014, 10:00–10:30, HSZ 03
Isospin Dynamics in Sr2IrO4 Revealed by Resonant Inelastic X-Ray Scattering — •Jungho Kim — Argonne National Lab, Argonne, IL, 60565 USA
Iridium oxides with strong relativistic spin-orbit coupling have received much attention due to intriguing sets of novel electronic and magnetic phases and phenomena, which were imagined for a long time but not realized in real world. Among many materials, Sr2IrO4 provides a model case for investigating essential aspects of the magnetic exchange interactions of the so-called Jeff=1/2 isospin states, which were established by various spectroscopic studies such as angle-resolved photoemission and magnetic x-ray scattering. In this talk, I will review on resonant inelastic x-ray scattering (RIXS) technique at the Ir absorption edges and novel aspects of iridium oxides with strong relativistic spin-orbit coupling. Low energy excitation spectra of Sr2IrO4 by RIXS will be discussed. The Jeff=1/2 isospin dynamics of Sr2IrO4 can be well described by the isotropic Heisenberg model, which renders the low-energy effective physics of Sr2IrO4 much akin to that in superconducting cuprates. Higher dd excitations between Jeff=1/2 and 3/2 are found to be dispersive in the same way as the single hole propagates in an antiferromagnetic background.