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摘要
The collective magnetic excitations in the spin-orbit Mott insulator (Sr1-x La-x)(2)IrO4 (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 J(eff) = 1/2 isospins, thus marking the departure of Sr2IrO4 from the essentially isotropic Heisenberg model appropriate for the superconducting cuprates.
- 出版日期2017-8-31
