Field-induced magnetic charge in a cubic Laves compound UAl2
Abstract
Magnetic diffraction of polarized neutrons by the cubic Laves compound UAl2 in a magnetic field has unveiled weak Bragg spots that are nominally forbidden. On the one hand, they can be viewed as magnetic analogues of the basis-forbidden (2, 2, 2) reflection in diamond-type structures that has been painstakingly and frequently investigated over almost a century. Alternatively, the pattern of weak intensities can be assigned to Dirac multipoles imbedded in field-induced magnetic charge. To this end, a published diffraction pattern is successfully confronted with intensities calculated from the appropriate magnetic space-group that includes Dirac dipoles (anapoles) to describe the basis-forbidden magnetic reflections, and conventional (axial) dipole and octupole multipoles to describe basis-allowed magnetic reflections.
Keywords
Cite
@article{arxiv.1806.04461,
title = {Field-induced magnetic charge in a cubic Laves compound UAl2},
author = {S. W. Lovesey and D. D. Khalyavin and G. van der Laan},
journal= {arXiv preprint arXiv:1806.04461},
year = {2020}
}