Counting kinks and magnons with the lattice: magnetoelastic effects in Cs${}_2$CoBr${}_4$

Abstract

We report low-temperature dilatometry and ultrasound measurements on the frustrated quasi-one-dimensional antiferromagnet Cs${}_2$CoBr${}_4$ across the entire cascade of field-induced magnetic phase transitions. The whole phase diagram can be recovered from these lattice probes, with distinct anomalies observed at each phase boundary. Elongation along the principal chain axis is found to closely track magnetization throughout the phase diagram. This behavior is interpreted in terms of kinks in the Néel structure and magnons in the transverse-ordered magnetic-BEC phases, each carrying a fixed lattice distortion. A simultaneous analysis of ultrasound and striction data allows us to quantify the strength of magnetoelastic coupling.

arXiv comment13 pages, 13 figures