Anisotropic exchange and spin-wave damping in pure and electron-doped Sr$_2$IrO$_4$
| Autor: | Pincini, Davide, Vale, James G., Donnerer, Christian, de la Torre, Alberto, Hunter, Emily C., Perry, Robin, Sala, Marco Moretti, Baumberger, Felix, McMorrow, Desmond F. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 96, 075162 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.96.075162 |
| Popis: | The collective magnetic excitations in the spin-orbit Mott insulator (Sr$_{1-x}$La$_x$)$_2$IrO$_4$ ($x=0,\,0.01,\,0.04,\, 0.1$) 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 $J_\text{eff}=1/2$ isospins, thus marking the departure of Sr$_2$IrO$_4$ from the essentially isotropic Heisenberg model appropriate for the superconducting cuprates. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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