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Anisotropic exchange and spin-wave damping in pure and electron-doped Sr_2IrO_4

Pincini, D. and Vale, J. G. and Donnerer, C. and de la Torre, A. and Hunter, E. C. and Perry, R. and Moretti Sala, M. and Baumberger, F. and McMorrow, D. F. (2017) Anisotropic exchange and spin-wave damping in pure and electron-doped Sr_2IrO_4. Physical Review B, 96 (7). Art. No. 075162. ISSN 2469-9950. doi:10.1103/PhysRevB.96.075162.

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The collective magnetic excitations in the spin-orbit Mott insulator (Sr_(1−x)La_x)_2IrO_4 (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 Sr_2IrO_4 from the essentially isotropic Heisenberg model appropriate for the superconducting cuprates.

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Alternate Title:Anisotropic exchange and spin-wave damping in pure and electron-doped Sr2IrO4
Additional Information:© 2017 American Physical Society. Received 27 March 2017; revised manuscript received 17 August 2017; published 31 August 2017. The authors would like to thank M. Rossi (ID20, ESRF) and S. Boseggia (UCL) for the helpful discussions and the support provided during the data analysis. This work is supported by the UK Engineering and Physical Sciences Research Council (Grants No. EP/N027671/1 and No. EP/N034694/1) and by the Swiss National Science Foundation (Grant No. 200021-146995). D.P. and J.G.V. contributed equally to this work.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Engineering and Physical Sciences Research Council (EPSRC)EP/N027671/1
Engineering and Physical Sciences Research Council (EPSRC)EP/N034694/1
Swiss National Science Foundation (SNSF)200021-146995
Issue or Number:7
Record Number:CaltechAUTHORS:20170901-091754761
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81062
Deposited By: Tony Diaz
Deposited On:01 Sep 2017 16:34
Last Modified:15 Nov 2021 19:40

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