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Paper detail

Isospin Dynamics in Sr2IrO4 : Forging Links to Cuprate Superconductivity

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.

preprint2011arXivOpen access
Jungho KimD. CasaM. H. UptonT. GogYoung-June KimJ. F. MitchellM. van VeenendaalM. DaghoferJ. van den BrinkG. KhaliullinB. J. Kim
cond-mat.str-el
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Jungho KimD. CasaM. H. UptonT. GogYoung-June KimJ. F. MitchellM. van VeenendaalM. DaghoferJ. van den BrinkG. KhaliullinB. J. Kim

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