Fig. 3. Magnetic susceptibility measurements before and after light irradiation.
Temperature dependence of χT for 1 (a) and 1a (b) in the cooling (blue) and heating (red) modes at a direct-current field of 1000 Oe. Insert: plots of 1/χ versus T for 1 and 1a with Curie-Weiss fitting. C and θ represent Curie temperature and Weiss constant; c temperature dependence of χT for 1a in the transition temperature regions with different sweep rates.