T. Gog

Magnetic excitation spectra of Sr2IrO4 probed by resonant inelastic x-ray scattering: establishing links to cuprate superconductors.

Jungho Kim, D. Casa, M. H. Upton, T. Gog, Young-June Kim, J. F. Mitchell, M. van Veenendaal, M. Daghofer, J. van den Brink, G. Khaliullin, B. J. Kim Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7 Material Science Division, Argonne National Laboratory, Argonne, IL 60439, USA Department of Physics, Northern Illinois University, De Kalb, IL 60115, USA Institute for Theoretical Solid Sate Physics, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany and Max Planck Institute for Solid State Research, Heisenbergstrae 1, D-70569 Stuttgart, Germany (Dated: December 11, 2012)

Crystal-field splitting and correlation effect on the electronic structure of A2IrO3.

The electronic structure of the honeycomb lattice iridates Na(2)IrO(3) and Li(2)IrO(3) has been investigated using resonant inelastic x-ray scattering (RIXS). Crystal-field-split d-d excitations are resolved in the high-resolution RIXS spectra. In particular, the splitting due to noncubic crystal fields, derived from the splitting of j(eff)=3/2 states, is much smaller than the typical spin-orbit energy scale in iridates, validating the applicability of j(eff) physics in A(2)IrO(3). We also find excitonic enhancement of the particle-hole excitation gap around 0.4 eV, indicating that the nearest-neighbor Coulomb interaction could be large. These findings suggest that both Na(2)IrO(3) and Li(2)IrO(3) can be described as spin-orbit Mott insulators, similar to the square lattice iridate Sr(2)IrO(4).

X-ray resonant scattering studies of orbital and charge ordering in Pr 1 − x Ca x MnO 3

We present the results of a systematic x-ray scattering study of the charge and orbital ordering in the manganite series

Large spin-wave energy gap in the bilayer iridate Sr3Ir2O7: evidence for enhanced dipolar interactions near the mott metal-insulator transition.

{\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}

Excitonic quasiparticles in a spin-orbit Mott insulator

with

Resonant Inelastic X-Ray Scattering of the Holon-Antiholon Continuum in SrCuO~2

x=0.25,

RESONANT X-RAY DIFFRACTION OF THE MAGNETORESISTANT PEROVSKITE PR0.6CA0.4MNO3

0.4, and 0.5. The temperature dependence of the scattering at the charge and orbital wavevectors, and of the lattice constants, was characterized throughout the ordered phase of each sample. It was found that the charge- and orbital-order wavevectors are commensurate with the lattice, in striking contrast to the results of electron and neutron diffraction studies of samples with

Testing the Validity of the Strong Spin-Orbit-Coupling Limit for Octahedrally Coordinated Iridate Compounds in a Model System Sr3CuIrO6

x=0.5.

Surface Layering of Liquids: The Role of Surface Tension

High-momentum-transfer resolution studies of the

Magnetic excitation spectrum of Na2IrO3 probed with resonant inelastic x-ray scattering

x=0.4