Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4
Abstract
The collective magnetic excitations in the spin-orbit Mott insulator (Sr1-xLax)2IrO4 (x=0,\,0.01,\,0.04,\, 0.1) were investigated by means of resonant inelastic x-ray scattering. We report significant magnon energy gaps at both the crystallographic and antiferromagnetic zone centers at all doping levels, along with a remarkably pronounced momentum-dependent lifetime broadening. The spin-wave gap is accounted for by a significant anisotropy in the interactions between Jeff=1/2 isospins, thus marking the departure of Sr2IrO4 from the essentially isotropic Heisenberg model appropriate for the superconducting cuprates.
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