Isospin Dynamics in Sr2IrO4 : Forging Links to Cuprate Superconductivity
Jungho Kim, D. Casa, M. H. Upton, T. Gog, Young-June Kim, J. F., Mitchell, M. van Veenendaal, M. Daghofer, J. van den Brink, G. Khaliullin, B., J. Kim
TL;DR
This study uses resonant inelastic x-ray scattering to analyze magnetic interactions in Sr2IrO4, revealing similarities to cuprate superconductors and providing insights into its spin-orbit entangled ground state and magnon dynamics.
Contribution
It demonstrates that Sr2IrO4's magnetic excitations are well described by an antiferromagnetic Heisenberg model, linking its physics to that of cuprate superconductors.
Findings
Magnon dispersion fits Heisenberg model
Observation of exciton modes with magnon renormalization
Strong analogy to hole propagation in cuprates
Abstract
We used resonant inelastic x-ray scattering to reveal the nature of magnetic interactions in Sr2IrO4, a 5d transition-metal oxide with a spin-orbit entangled ground state and Jeff=1/2 magnetic momemts, referred to as 'isospins'. The magnon dispersion in Sr2IrO4 is well described by an antiferromagnetic Heisenberg model with isospin one-half moments on a square lattice, which renders the low-energy effective physics of Sr2IrO4 much akin to that in superconducting cuprates. This is further supported by the observation of exciton modes in Sr2IrO4 whose dispersion is strongly renormalized by magnons, which can be understood by analogy to the hole propagation in the background of antiferromagnetically ordered spins in the cuprates.
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