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Complex chiral modulations in FeGe close to magnetic ordering
E Moskvin1, S Grigoriev1, V Dyadkin2
1Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina, Saint-Petersburg 188300, Russia and Saint-Petersburg State University, Ulyanovskaya 1, Saint-Petersburg 198504, Russia.
Physical Review Letters
|August 29, 2014
Summary
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.
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.
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