Magnetic frustration, arising from the competition of exchange interactions, has received great attention because of its relevance to exotic quantum phenomena in materials. In the current work, we report an unusual checkerboard-shaped scattering anomaly in FeGe2, far from the known incommensurate magnetic satellite peaks, for the first time by inelastic neutron scattering. More surprisingly, such phenomenon appears as spin dynamics at low temperature, but it becomes prominent above N\'eel transition as elastic scattering. A new model Hamiltonian that includes an intraplane next-nearest neighbor was proposed and attributes such anomaly to the near-perfect magnetic frustration and the emergence of unexpected two-dimensional magnetic order in the quasi-one-dimensional FeGe2.
@article{arxiv.2108.06882,
title = {Frustration-induced diffusive scattering anomaly and dimension change in $\rm FeGe_2$},
author = {Yaokun Su and Hillary L. Smith and Matthew B. Stone and Douglas L. Abernathy and Mark D. Lumsden and Carl P. Adams and Chen Li},
journal= {arXiv preprint arXiv:2108.06882},
year = {2022}
}