Electronic and magnetic excitations in the "half-stuffed" Cu--O planes of Ba${}_2$Cu${}_3$O${}_4$Cl${}_2$ measured by resonant inelastic x-ray scattering

Abstract

We use resonant inelastic x-ray scattering (RIXS) at the Cu L${}_3$ edge to measure the charge and spin excitations in the "half-stuffed" Cu--O planes of the cuprate antiferromagnet Ba${}_2$Cu${}_3$O${}_4$Cl${}_2$. The RIXS line shape reveals distinct contributions to the $dd$ excitations from the two structurally inequivalent Cu sites, which have different out-of-plane coordinations. The low-energy response exhibits magnetic excitations. We find a spin-wave branch whose dispersion follows the symmetry of a CuO${}_2$ sublattice, similar to the case of the "fully-stuffed" planes of tetragonal CuO (T-CuO). Its bandwidth is closer to that of a typical cuprate material, such as Sr${}_2$CuO${}_2$Cl${}_2$, than it is to that of T-CuO. We interpret this result as arising from the absence of the effective four-spin inter-sublattice interactions that act to reduce the bandwidth in T-CuO.

arXiv comment10 pages, 8 figures

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