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

Authors
Pincini, D.
Vale, J. G.
Donnerer, C.
Hunter, E. C.
Perry, R.
Moretti Sala, M.
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Published in Physical Review. B, Condensed Matter. 2017, vol. 96, no. 7
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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Other version: https://link.aps.org/doi/10.1103/PhysRevB.96.075162
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PINCINI, D. et al. Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4. In: Physical Review. B, Condensed Matter, 2017, vol. 96, n° 7. https://archive-ouverte.unige.ch/unige:101915

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Deposited on : 2018-02-05

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