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Doping Evolution of Magnetic Order and Magnetic Excitations in (Sr1−xLax)3Ir2O7

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Lu Xingye, McNally D. E., Moretti Sala M., Terzic J., Upton M. H., Casa D., Ingold G., Cao G., Schmitt T.,
Project Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
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Original article (peer-reviewed)

Journal Physical Review Letters
Volume (Issue) 118(2)
Page(s) 027202 - 027202
Title of proceedings Physical Review Letters
DOI 10.1103/physrevlett.118.027202

Open Access

URL https://arxiv.org/abs/1608.06268
Type of Open Access Repository (Green Open Access)

Abstract

We use resonant elastic and inelastic x-ray scattering at the Ir-L3 edge to study the doping-dependent magnetic order, magnetic excitations, and spin-orbit excitons in the electron-doped bilayer iridate (Sr1−xLax)3Ir2O7 (0≤x≤0.065). With increasing doping x, the three-dimensional long range antiferromagnetic order is gradually suppressed and evolves into a three-dimensional short range order across the insulator-to-metal transition from x=0 to 0.05, followed by a transition to two-dimensional short range order between x=0.05 and 0.065. Because of the interactions between the Jeff=12 pseudospins and the emergent itinerant electrons, magnetic excitations undergo damping, anisotropic softening, and gap collapse, accompanied by weakly doping-dependent spin-orbit excitons. Therefore, we conclude that electron doping suppresses the magnetic anisotropy and interlayer couplings and drives (Sr1−xLax)3Ir2O7 into a correlated metallic state with two-dimensional short range antiferromagnetic order. Strong antiferromagnetic fluctuations of the Jeff=12 moments persist deep in this correlated metallic state, with the magnon gap strongly suppressed.
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