Magnetic structure of the kagome metal YbFe 6 Ge 6 in view of Bragg diffraction
Year: 2025
Type: article
Abstract: A material in possession of localized 4 f -electron magnetism and delocalized 3 d -electron or band magnetism can often present enigmatic physical phenomena, and there has been a longstanding interest in the kagome metal YbFe 6 Ge 6 . More recently, because of an investigation of a so-called anomalous Hall effect, or topological Hall effect, and magnetic neutron Bragg diffraction [Yao , ]. Iron moments in the two-dimensional layers of a hexagonal nuclear structure undergo collinear antiferromagnetic order below a temperature ≈ 500 K. The moments depart from the c axis in a spontaneous transition at ≈ 63 K to an orthorhombic structure. The magnetism of Yb ions appears to behave independently, which can be confirmed using resonant x-ray Bragg diffraction enhanced by a Fe atomic resonance. The inferred magnetic structure is P(parity)T(time)-symmetric (anti-inversion 1 ′ ¯ ) collinear antiferromagnetism that does not couple to circular polarization (helicity) in primary x-rays, unlike altermagnetism. A linear magnetoelectric effect is allowed, and Kerr rotation and the piezomagnetic effect are forbidden. Symmetry informed Bragg diffraction patterns for future x-ray and neutron experiments are shown to be rich in Fe magnetic properties of orthorhombic YbFe 6 Ge 6 , including space-spin correlations, anapoles, and Dirac quadrupoles familiar in high- T c ceramic superconductors.
DOI: 10.1103/rn9y-6spg
Author: S. W. Lovesey
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4414737937