Magnetic structural change of Sr2IrO4 upon Mn doping

摘要

The layered 5d transition metal oxide Sr2IrO4 has been shown to host a novelJeff=1/2 Mott spin orbit insulating state with antiferromagnetic ordering,leading to comparisons with the layered cuprates. Here we study the effect ofsubstituting Mn for Ir in single crystals of Sr2Ir0.9Mn0.1O4 through aninvestigation involving bulk measurements and resonant x-ray and neutronscattering. We observe a new long range magnetic structure emerge upon dopingthrough a reordering of the spins from the basal plane to the c-axis with areduced ordering temperature compared to Sr2IrO4. The strong enhancement of themagnetic x-ray scattering intensity at the L3 edge relative to the L2 edgeindicates that the Jeff=1/2 state is robust and capable of hosting a variety ofground states.