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Complex chiral modulations in FeGe close to magnetic ordering.

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Detailed polarized small-angle neutron scattering on cubic iron germanium (FeGe) revealed a segmented A-phase region. Hexagonal Bragg-spot patterns were observed in this region under specific magnetic field conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Cubic iron germanium (FeGe) is a material exhibiting complex magnetic ordering.
  • Understanding the magnetic phase diagram of FeGe is crucial for its potential applications.

Purpose of the Study:

  • To investigate the magnetic phase diagram of cubic FeGe using polarized small-angle neutron scattering.
  • To analyze the behavior of the A-phase region under varying magnetic field orientations and temperatures.

Main Methods:

  • Detailed polarized small-angle neutron scattering (PSANS) experiments were conducted.
  • Magnetic fields were applied both transverse and longitudinal to the scattering vector.
  • Scattering intensity and Bragg-spot patterns were analyzed across different (H, T) phase diagrams.

Main Results:

  • A segmented A-phase region was identified in the (H, T) phase diagrams of FeGe, located below the onset of magnetic order.
  • Hexagonal Bragg-spot patterns were consistently observed throughout the A-phase for the longitudinal magnetic field geometry.
  • Scattering intensity was detected in parts of the A phase for both transverse and longitudinal geometries, with vanishing intensity only in a specific A(1) pocket under transverse fields.

Conclusions:

  • The study elucidates the complex magnetic structure within the A-phase of FeGe.
  • The observed scattering patterns provide insights into the magnetic ordering and symmetry within this phase.
  • The distinct behavior in the A(1) pocket suggests unique magnetic properties under specific field conditions.