Long range magnetic ordering in Na${}_2$IrO${}_3$

Abstract

We report a combined experimental and theoretical investigation of the magnetic structure of the honeycomb lattice magnet Na${}_2$IrO${}_3$, a strong candidate for a realization of a gapless spin-liquid. Using resonant x-ray magnetic scattering at the Ir L${}_3$-edge, we find 3D long range antiferromagnetic order below T${}_N$=13.3 K. From the azimuthal dependence of the magnetic Bragg peak, the ordered moment is determined to be predominantly along the {\it a}-axis. Combining the experimental data with first principles calculations, we propose that the most likely spin structure is a novel "zig-zag" structure.

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