A pseudospinon continuum in
2020
In so-called systems, including some iridates and ruthenates, the coherent superposition of orbitals in the ground state gives rise to hopping processes that strongly depend on the bond geometry. Resonant inelastic X-ray scattering measurements on CaIrO reveal a prototypical pseudo spinon continuum, a hallmark of one-dimensional (1D) magnetic systems despite its three-dimensional crystal structure. The experimental spectra compare very well to the calculated magnetic dynamical structure factor of weakly coupled spin-1/2 chains. We attribute the onset of such quasi-1D magnetism to the fundamental difference in the magnetic interactions between the pseudo spins along the corner- and edge-sharing bonds in CaIrO.
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