J. Terzic

Lattice-tuned magnetism of Ru 4 + ( 4 d 4 ) ions in single crystals of the layered honeycomb ruthenates Li 2 RuO 3 and Na 2 RuO 3

We synthesize and study single crystals of the layered honeycomb lattice Mott insulators Na2RuO3 and Li2RuO3 with magnetic Ru4+(4d4) ions. The newly found Na2RuO3 features a nearly ideal honeycomb lattice and orders antiferromagnetically at 30 K. Single-crystals of Li2RuO3 adopt a honeycomb lattice with either C2/m or more distorted P21/m below 300 K, depending on detailed synthesis conditions. We find that Li2RuO3 in both structures hosts a well-defined magnetic state, in contrast to the singlet ground state found in polycrystalline Li2RuO3. A phase diagram generated based on our results uncovers a new, direct correlation between the magnetic ground state and basal-plane distortions in the honeycomb ruthenates.

Tuning magnetic coupling in Sr2IrO4 thin films with epitaxial strain.

We report x-ray resonant magnetic scattering and resonant inelastic x-ray scattering studies of epitaxially strained Sr2IrO4 thin films. The films were grown on SrTiO3 and (LaAlO3)0.3(Sr2AlTaO6)0.7 substrates, under slight tensile and compressive strains, respectively. Although the films develop a magnetic structure reminiscent of bulk Sr2IrO4, the magnetic correlations are extremely anisotropic, with in-plane correlation lengths significantly longer than the out-of-plane correlation lengths. In addition, the compressive (tensile) strain serves to suppress (enhance) the magnetic ordering temperature TN, while raising (lowering) the energy of the zone-boundary magnon. Quantum chemical calculations show that the tuning of magnetic energy scales can be understood in terms of strain-induced changes in bond lengths.

Selective growth of epitaxial Sr2IrO4 by controlling plume dimensions in pulsed laser deposition

\mathrm{S}{\mathrm{r}}_{2}\mathrm{Ir}{\mathrm{O}}_{4}

Epitaxial Ba2IrO4 thin-films grown on SrTiO3 substrates by pulsed laser deposition

is a spin-orbit-coupled insulator with an antiferromagnetic (AFM) transition at

Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

{T}_{N}=240\phantom{\rule{0.16em}{0ex}}\mathrm{K}

Investigations of metastable Ca2IrO4 epitaxial thin-films: systematic comparison with Sr2IrO4 and Ba2IrO4

. We report results of a comprehensive study of single-crystal

Optical Signatures of Spin-Orbit Exciton in Bandwidth-Controlled Sr 2 IrO 4 Epitaxial Films via High-Concentration Ca and Ba Doping

\mathrm{S}{\mathrm{r}}_{2}\mathrm{I}{\mathrm{r}}_{1\ensuremath{-}x}\mathrm{T}{\mathrm{b}}_{x}{\mathrm{O}}_{4}\phantom{\rule{0.16em}{0ex}}(0\ensuremath{\le}x\ensuremath{\le}0.03)

Evolution of Magnetism in Single-Crystal Ca2Ru1-xIrxO4 (0

. This study found that a mere 3%

\le

(x=0.03)