Fig. 2: Magnetic properties of V_1/3NbS₂.

a Temperature dependence of the magnetization M of V_1/3NbS₂ measured for B =  0.1 T applied along the x (\([2\bar{1}\bar{1}0]\)), y (\([01\bar{1}0]\)) and z ([0001]) directions, respectively. Data obtained under zero-field-cooling (ZFC) and field-cooling (FC) protocols are shown using solid and open symbols, respectively. The arrow marks the transition into the AFM state at the Néel temperature T_N  = 50(1) K. Inset: the inverse susceptibility (1/χ) vs. temperature T for B∥y and z, The linear fit (solid line) to the high-T data above 300 K yields a Curie-Weiss temperature θ_W = −70(4) K (Methods). b Isothermal magnetization M loop measured at select temperatures by sweeping the magnetic field between B  =  ±7 T aligned along the z-direction. Inset: zoomed plot showing the hysteresis loop in M that develops at low T. c Magnetic Bragg peak at Q  =  (0001). The change in line shape reflects hysteretic changes in the magnetic domain size ξ along y under up- and down-sweeps of B∥x measured at 2 K. Relative to the zero field and 8 T state, ξ is strongly reduced upon raising the field from zero to 4 T. d Peak intensity of the (0001) magnetic Bragg peak as a function of temperature. The solid line in the main panel is a fit to the power-law form \(I \sim {({T}_{{{{\rm{N}}}}}-T)}^{2\beta }+{I}_{0}\), where β is the critical exponent, and I₀ is the background intensity above T_N. This fit yields β =  0.363(2), T_N  =  50.1(1) K, and I₀  = 247(5) counts per 1500 monitor counts. Inset: a log-log plot of the magnetic peak intensity vs. the reduced temperature (T_N  − T)/T_N. The solid line shows power-law behavior near the critical temperature. Error bars in all neutron scattering figures represent one standard deviation.