Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 J_eff=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 J_eff=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 J_eff=1/2 and 3/2 are found to be dispersive in the same way as the single hole propagates in an antiferromagnetic background.