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

Pincini, D; Vale, JG; Donnerer, C; de la Torre, A; Hunter, EC; Perry, R; Sala, MM; ... McMorrow, DF; + view all (2017) Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4. Physical Review B , 96 (7) , Article 075162. 10.1103/PhysRevB.96.075162. Green open access

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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.

Type: Article
Title: Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.96.075162
Publisher version: http://doi.org/10.1103/PhysRevB.96.075162
Language: English
Additional information: © 2017 American Physical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Condensed Matter, Physics, MOTT INSULATOR, LA2-XSRXCUO4
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1550715
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