Fig. 3: Evolution of the magnetic scattering peak.

a, b Evolution of the magnetic scattering intensity for the 778.9 eV resonance induced by (a) 800 nm and (b) 400 nm pumps with various fluences, normalized by the equilibrium spectral intensities. The solid curves delineate the double-exponential fitting using Eq. (1). The pump-probe measurements are conducted at 23 K. The inset shows the optical absorption spectra of Na₂Co₂TeO₆, with arrows highlighting the 400 nm and 800 nm photon energies, respectively. The dashed line indicates the band gap of ~2 eV. c The quench time τ_q extracted from (a, b) as a function of pump fluence. d Temperature dependence of the quench times for a 400 nm pump with different pump fluences. The dashed lines denote the transition temperatures of the 3D and 2D magnetic orders.