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.

References in corpus (6)

• Novel magnetic order in pseudogap state of high Tc copper oxides superconductors
• Theory of neutron scattering by electrons in magnetic materials
• Optical non-reciprocity in magnetic structures related to high-Tc superconductors
• Quasi-static magnetoelectric quadrupoles as the order parameter for the pseudo-gap phase in cuprate superconductors
• Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction
• Polarized single crystal neutron diffraction study of the zero-magnetization ferromagnet Sm${}_{1-x}$Gd${}_x$Al${}_2$ (x = 0.024)

Cited by in corpus (3)

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