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

Details Long range magnetic ordering in Na$_2$IrO$_3$ Long range magnetic ordering in Na$_2$IrO$_3$

2011-04-20

arxiv.org/abs/1104.4046v2

Phys. Rev. B 83, 220403(R) (2011)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.83.220403

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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