A $j_{\mathrm{eff}}=1/2$ pseudospinon continuum in CaIrO${}_3$

Abstract

In so-called $j_{\mathrm{eff}}=1/2$ systems, including some iridates and ruthenates, the coherent superposition of $t_{2g}$ orbitals in the ground state gives rise to hopping processes that strongly depend on the bond geometry. Resonant inelastic x-ray scattering (RIXS) 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${}_3$.

8 pages, 4 figures

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