On the magnetic structure of Sr3Ir2O7: an x-ray resonant scattering study
S. Boseggia, R Springell, H C Walker, A T Boothroyd, D Prabhakaran, S, P Collins, D F McMorrow
TL;DR
This study uses x-ray resonant scattering to analyze the magnetic structure of Sr3Ir2O7, revealing domain behavior and that Ir magnetic moments align along the c axis, differing from related compounds.
Contribution
It provides detailed insight into the magnetic domains and moment orientation in Sr3Ir2O7 using azimuthal and polarization dependent x-ray scattering.
Findings
Domains of two magnetic structures are stable and independent of thermal history.
Ir magnetic moments are aligned along the c axis.
Contrasts with single-layer Sr2IrO4 where moments are in the ab plane.
Abstract
This report presents azimuthal dependent and polarisation dependent x-ray resonant magnetic scattering at the Ir L3 edge for the bilayered iridate compound, Sr3Ir2O7. Two magnetic wave vectors, k1=(1/2,1/2,0) and k2=(1/2,-1/2,0), result in domains of two symmetry-related G-type antiferromagnetic structures, noted A and B, respectively. These domains are approximately 0.02 mm^2 and are independent of the thermal history. An understanding of this key aspect of the magnetism is necessary for an overall picture of the magnetic behaviour in this compound. Azimuthal and polarisation dependence of magnetic reflections, relating to both magnetic wave vectors, show that the Ir magnetic moments in the bilayer compound are oriented along the c axis. This contrasts with single layer Sr2IrO4 where the moments are confined to the ab plane.
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