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Field-induced magnetic charge in a cubic Laves compound UAl2

DOI: 10.1088/1742-6596/1316/1/012004 DOI Help

Authors: S. W. Lovesey (ISIS Facility; Diamond Light Source) , D. D. Khalyavin (ISIS Facility) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: PNCMI 2018
Peer Reviewed: No

State: Published (Approved)
Published: December 2019

Open Access Open Access

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 (Imm'a') that includes Dirac dipoles (anapoles) to describe the basis-forbidden magnetic reflections (Ho+Ko+Lo = 4n+2), and conventional (axial) dipole and octupole multipoles to describe basis-allowed magnetic reflections.

Journal Keywords: magnetism; scattering; multipole moments

Subject Areas: Physics, Materials, Mathematics


Technical Areas: Theoretical Physics

Added On: 15/12/2019 10:10

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