A \(^{151}\)Eu Mössbauer investigation of Magnetic Ordering in the Topological Material Candidate EuZnBi\(_2\)

Recently, Junbao He et al. reported on magnetic ordering in the topological candidate EuZnBi \(_2\) $_2^{}$ (He et al. J. Supercond. Nov. Magn. 37, 579 2024) and suggested that there is a spin reorientation near 15 K, below the initial antiferromagnetic transition at T \(_N\) $_N^{}$ =20 K. Here we use \(^{151}\) $_{}^{151}$ Eu Mössbauer spectroscopy to show that the situation is more complex. The initial ordering involves an incommensurate sinusoidally modulated structure that progressively squares up on further cooling.