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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Neutron Scattering

Background:

  • Magnetic neutron scattering is a key technique for probing magnetic structures.
  • Electronic multipoles, such as dipoles, play a crucial role in material properties.
  • Anapoles, a type of electronic multipole, possess unique polar and magnetic characteristics.

Purpose of the Study:

  • To expand the scope of magnetic neutron scattering by observing novel electronic multipoles.
  • To investigate the presence and characteristics of electronic Dirac dipoles (anapoles) in magnetic materials.
  • To analyze the magnetic structure of a specific ferromagnet using neutron scattering.

Main Methods:

  • Utilized magnetic neutron scattering to probe the magnetic structure of Sm_{0.976}Gd_{0.024}Al_{2}.
  • Focused on basis-forbidden reflections, including the (2, 2, 2) reflection, to detect specific multipole orders.
  • Measured magnetic amplitudes at selected reflections for detailed structural analysis.

Main Results:

  • Observed electronic Dirac dipoles (anapoles) in a zero-magnetization ferromagnet, Sm_{0.976}Gd_{0.024}Al_{2}.
  • These anapoles were found to be polar (parity odd) and magnetic (time odd).
  • Measured magnetic amplitudes at four basis-forbidden reflections were in excellent agreement with calculations based on the appropriate magnetic space group.

Conclusions:

  • The observation of electronic Dirac dipoles significantly expands the capabilities of magnetic neutron scattering.
  • The results confirm the presence of anapoles in a zero-magnetization ferromagnet with a diamond-type structure.
  • This study provides a foundation for exploring anapoles and other exotic electronic multipoles in magnetic materials.