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Direct Observation of Anapoles by Neutron Diffraction
S W Lovesey1,2, T Chatterji3, A Stunault3
1ISIS Facility, STFC, Didcot, Oxfordshire OX11 0QX, United Kingdom.
Abstract:
The scope of magnetic neutron scattering has been expanded by the observation of electronic Dirac dipoles (anapoles) that are polar (parity odd) and magnetic (time odd). A zero-magnetization ferromagnet Sm_{0.976}Gd_{0.024}Al_{2} with a diamond-type structure presents Dirac multipoles at basis-forbidden reflections that include the standard (2, 2, 2) reflection. Magnetic amplitudes measured at four such reflections are in full accord with a structure factor calculated from the appropriate magnetic space group.
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