Fig. 1: Basic properties and magneto-optical Kerr effect of Gd2PdSi3.
From: Topological magneto-optical effect from skyrmion lattice
a The AlB2-type crystal structure of Gd2PdSi3 (left panel) and the schematic illustration of the triangular skyrmion lattice (SkL) (right panel). b Magnetic phase diagram with magnetic field (H) parallel to the c axis and a contour map of topological Kerr rotation angle θKT at 0.3 eV. IC-1 and IC-2 represent incommensurate spin-state phases (see Supplementary Fig. 1), and PM represents the paramagnetic phase. The open circles represent phase boundaries determined by magnetization measurements. c Magnetic-field dependence of the d.c. Hall conductivity σxy (left axis) and magnetization M (right axis) for H || c at 8 K. Hint represents the internal magnetic field, considering the demagnetization effect. The red shaded area denotes the SkL phase. d, e Magnetic-field dependence of the magneto-optical Kerr (d) rotation angle θK and (e) ellipticity ηK for H || c at 8.4 K. The data are shifted by vertical offsets of 0.5 mrad. The black dotted curves in (d) and (e) denote the conventional M-linear MOKE θKM and ηKM; the shaded areas in (d) and (e) represent the topological components θKT and ηKT (see main text and Supplementary Fig. 3 for their definition). The inset in (e) shows the schematic illustration of the MOKE measurement geometry.
