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We have performed resonant magnetic x-ray scattering (RMXS) measurements onsingle crystal samples of the bilayer iridate Sr3Ir2O7. We observe thedevelopment of antiferromagnetic order below T* ~ 260 K, which persists down toT = 4 K under both field-cooled (fc) and zero-field-cooled (zfc) conditions.The temperature dependence of the fc and zfc magnetic Bragg peaks suggests thepresence of competition between canted and collinear antiferromagnetic groundstates. Under zfc conditions, we observe a suppression of magnetic peakintensity at T_D ~ 50 K which can be attributed to a spin reorientationtransition. Under fc conditions, we find that the canted antiferromagneticstate is stabilized over a much wider range of temperatures, with significantlyenhanced magnetic correlation lengths within the Ir-O layers. The fielddependence of the magnetic Bragg peaks provides no evidence of field-inducedphase transitions for H < 4 T.

Field-induced magnetic behavior of the bilayer iridate Sr3Ir2O7