Anisotropic exchange and spin-wave damping in pure and electron-doped Sr<sub>2</sub>IrO<sub>4</sub>

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Title		Anisotropic exchange and spin-wave damping in pure and electron-doped Sr₂IrO₄
Authors		Pincini, D. Vale, J. G. Donnerer, C. De La Torre, Alberto Hunter, E. C. Perry, R. Moretti Sala, M. Baumberger, Félix McMorrow, D. F. show all authors [1 - 9]
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.
Identifiers		DOI: 10.1103/PhysRevB.96.075162
Full text		Article (Published version) (1.2 MB) - Limited access to UNIGE Other version: https://link.aps.org/doi/10.1103/PhysRevB.96.075162
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Citation (ISO format)		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