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Published August 15, 2017 | Published + Supplemental Material + Submitted
Journal Article Open

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

Abstract

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.

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.

Attached Files

Published - PhysRevB.96.075162.pdf

Submitted - 1703.09051.pdf

Supplemental Material - La_doped_Sr214_SUPPLEMENTAL.pdf

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August 19, 2023
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