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.

Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4

Moretti Sala, M.;
2017-01-01

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.
2017
Electronic, Optical and Magnetic Materials; Condensed Matter Physics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1049011
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