A $$\hbox {j}_{\mathrm{eff}} = 1/2$$jeff=1/2 pseudospinon continuum in $$\hbox {CaIrO}_{{3}}$$CaIrO3
2020
In so-called
$$j_\mathrm {eff} = 1/2$$
systems, including some iridates and ruthenates, the coherent superposition of
$$t_\mathrm {2g}$$
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
$$_3$$
reveal a prototypical
$$j_\mathrm {eff} = 1/2$$
pseudospinon 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
$$j_\mathrm {eff} = 1/2$$
pseudospins along the corner- and edge-sharing bonds in CaIrO
$$_3$$
.
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