Fig. 4: Magnetic linear birefringence of α-RuCl3.
From: Magneto-optical study of metamagnetic transitions in the antiferromagnetic phase of α-RuCl3

a Iso-magnetic MLB as a function of the temperature. Data are plotted offset for clarity. The inset shows the calculated first derivative of ellipticity (dη/dT) normalized to the bath temperature. Red arrows indicate the maximum of the derivative indicating the magnetic phase transition, which is indicated by the gray dashed arrow in the main figure. b MLB η for Bab∥{1, 1, 0} as a function of the in-plane magnetic field at different temperatures. The arrows indicate the anomalies discussed in the main text.