Exploration of magnetoelastic deformations in spin-chain compound CuBr${}_2$

Abstract

We investigate a spin-$\frac{1}{2}$ antiferromagnet, CuBr${}_2$, which has quasi-one-dimensional structural motifs. The system has previously been observed to exhibit unusual Raman modes possibly due to a locally deformed crystal structure driven by the low-dimensional magnetism. Using hard X-ray scattering and neutron total scattering, here we aim to verify a specific form of tetramerized lattice deformation proposed in the previous study. Apart from diffuse scattering signals which we can reproduce by performing a thorough modeling of the lattice's thermal vibrations, we do not observe evidence for a tetramerized lattice structure within our detection sensitivity. As a result, it is more likely that the unusual Raman modes in CuBr${}_2$ arise from classical magnon-phonon hybridization, rather than from quantum spin-singlet-driven lattice deformation.

arXiv comment8 pages, 6 figures

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