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.

8 pages, 6 figures

References in corpus (9)

• Quantum magnetism and criticality
• Heat conduction in low-dimensional quantum magnets
• Curvature effects in statics and dynamics of low dimensional magnets
• CuBr2-A New Multiferroic Material with High Critical Temperature
• Magnon-polarons in van der Waals antiferromagnet FePS3
• Tunable Magnetic Transition to a Singlet Ground State in a 2D Van der Waals Layered Trimerized Kagomé Magnet
• The Valence Bond Glass phase
• Impurity-doped Kagome Antiferromagnet: A Quantum Dimer Model Approach
• Antiferromagnetic order in weakly coupled random spin chains