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Block-type antiferromagnetic state in BaFe2Se3studied by57Fe nuclear forward scattering under pressure
Shugo Ikeda1, Haruki Tamura1, Shiro Kawachi1
1Graduate School of Science, University of Hyogo, Koto, Hyogo 678-1297, Japan.
The iron-based compound BaFe2Se3 maintains its unique block-type antiferromagnetic structure under high pressure. Nuclear resonant forward scattering reveals this exotic magnetic order is robust, showing minimal changes with increasing hydrostatic pressure.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- BaFe2Se3 is an iron-based spin-ladder compound.
- It exhibits block-type antiferromagnetic order and orthorhombic to monoclinic structural distortion.
Purpose of the Study:
- Investigate the behavior of block-type antiferromagnetic states in BaFe2Se3 under pressure.
- Understand the impact of hydrostatic pressure on magnetic order and structural symmetry.
Main Methods:
- Utilized 57Fe nuclear resonant forward scattering (NFS) with interference polarimetry.
- Analyzed photon scattering and interference with magnetized alpha-Fe to probe hyperfine interactions.
Main Results:
- Identified four nonequivalent Fe sites, consistent with 57Fe NFS spectra below ordering temperature.
- Magnetic hyperfine fields tilted significantly from the b-axis, preserving block-type antiferromagnetic order.
- Monoclinic distortion remained minimal up to 3.8 GPa; block-type antiferromagnetic structure persisted up to 3.4 GPa.
Conclusions:
- Block-type antiferromagnetic order in BaFe2Se3 is robust under hydrostatic pressure.
- Refined hyperfine interaction parameters showed negligible changes with pressure.
- The compound's exotic magnetic structure demonstrates remarkable stability.
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