Journal of the Physical Society of Japan· 2026Q2
Competing Spin and Charge Symmetry Breaking in the Nematic State of EuFe 2 As 2 Revealed by 57 Fe Nuclear Forward Scattering
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- Q2SCImago
- 2026year
Short summary
EuFe2As2 exhibits a monoclinic charge-density modulation coexisting with collinear stripe-type antiferromagnetic order, challenging the conventional orthorhombic picture of iron-based superconductors.
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Key points
- EuFe2As2 displays a stripe-type antiferromagnetic (sAFM) order.
- The electric field gradient tensor reveals a spontaneous monoclinic symmetry breaking.
- This monoclinic distortion is observed even in the low-temperature paramagnetic phase.
- The state arises from competing spin-density and charge-density channels.
AI-generated from the title and abstract; the full text is not read.
Abstract
The electronic and magnetic symmetries of EuFe 2 As 2 at ambient pressure were investigated by combining 57 Fe nuclear forward scattering (NFS) with magnetic-field-induced detwinning. While the magnetic hyperfine field ([Formula: see text]) is consistent with the conventional stripe-type antiferromagnetic (sAFM) configuration, the electric field gradient (EFG) tensor reveals a spontaneous symmetry lowering to monoclinic. Furthermore, this monoclinic distortion persists even in the pressure-induced paramagnetic phase at low temperatures, which is consistent with the asymmetry of the X-ray diffraction peaks. Our findings characterize a unique state arising from an intense competition between the spin-density ([Formula: see text]) and charge-density (EFG) channels. This monoclinic charge-density modulation, coexisting with collinear sAFM order, challenges the conventional orthorhombic picture of iron-based superconductors and provides a new perspective on multi-channel nematic instability.
The authors' abstract, as published at the source. Journal of the Physical Society of Japan, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science