Fig. 1: General frameworks of kagome-lattice crystal and amorphous FexSn1–x.
From: Berry curvature contributions of kagome-lattice fragments in amorphous Fe–Sn thin films
a Kagome-lattice crystal with long-range order in the lattice. The specific symmetry of the kagome-lattice18,19 is discussed to contribute to the emergence of topological electronic states with b linearly dispersed bands in k space. The z-component of Berry curvature Ωz(k) becomes finite near the band singularity. When the Fermi energy EF is close to the E of the band singularity, large intrinsic AHE and ANE are induced. c μ0H dependences of the tangent of Hall angle σxy/σxx for the Fe0.75Sn0.25 poly-film at T = 300 K. d Amorphous without long-range order. The fragments with short-range kagome-lattice order, proposed as the microscopic picture of the FexSn1–x amo-film in this study, are illustrated. e For such amorphous materials, Ωz(k) is not defined. f μ0H dependences of σxy/σxx for the Fe0.74Sn0.26 amo-film at T = 300 K.
