Direct observation of anapoles by neutron diffraction

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 Sm0.976Gd0.024Al2 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.

arXiv comment4 pages, 3 figures

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• Magnetic Multipoles in a Ruthenate Ca3Ru2O7
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• Orthoferrite with a hidden lanthanide magnetic motif: NdFeO3
• Polar magnetization unveiled by polarized neutron diffraction
• Antiferromagnetic iron based magnetoelectric compounds
• Orbital current signature using neutron diffraction