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We used resonant inelastic x-ray scattering to reveal the nature of magneticinteractions in Sr2IrO4, a 5d transition-metal oxide with a spin-orbitentangled ground state and Jeff=1/2 magnetic momemts, referred to as'isospins'. The magnon dispersion in Sr2IrO4 is well described by anantiferromagnetic Heisenberg model with isospin one-half moments on a squarelattice, which renders the low-energy effective physics of Sr2IrO4 much akin tothat in superconducting cuprates. This is further supported by the observationof exciton modes in Sr2IrO4 whose dispersion is strongly renormalized bymagnons, which can be understood by analogy to the hole propagation in thebackground of antiferromagnetically ordered spins in the cuprates.

Isospin Dynamics in Sr2IrO4 : Forging Links to Cuprate Superconductivity