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Pressure-induced inhomogeneous chiral-spin ground state in FeGe
A Barla1, H Wilhelm2, M K Forthaus3
1Istituto di Struttura della Materia, ISM-CNR, I-34149 Trieste, Italy and ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallés, Barcelona, Spain.
Physical Review Letters
|January 24, 2015
Summary
The chiral magnet FeGe exhibits an extended precursor phase region above its helimagnetic ordering temperature, even beyond the quantum phase transition. This indicates enlarged chiral magnetic precursor phenomena due to increased spin fluctuations.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Chiral magnets exhibit complex magnetic ordering.
- Understanding precursor phases is crucial for quantum phase transitions.
- FeGe is a model system for studying chiral magnetism.
Purpose of the Study:
- Investigate the magnetic precursor phase in FeGe under pressure.
- Determine the behavior of magnetic hyperfine fields and their distribution.
- Explore the influence of pressure on chiral magnetic phenomena.
Main Methods:
- Utilized (57)Fe nuclear forward scattering.
- Applied high pressure up to 31 GPa.
- Performed ab initio calculations for theoretical support.
Main Results:
- Observed an extremely large precursor phase region above the helimagnetic ordering temperature.
- Found a decrease in magnetic hyperfine field with increasing pressure.
- Noted a significant increase in the distribution width of hyperfine fields, indicating inhomogeneity.
- Observed persistent hyperfine fields up to 28.5 GPa, with no magnetic order signatures at 31 GPa.
Conclusions:
- Chiral magnetic precursor phenomena are significantly enlarged in FeGe.
- Increasing spin fluctuations near the quantum phase transition drive these phenomena.
- An inhomogeneous chiral-spin state characterizes the precursor region.
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