The Δ k F of the α 1 and α 2 bands in the positive (near K) and negative (near K′) momentum directions extracted from fits to these MDCs ( h ). The colours indicate temperature as in e and f . These values indicate a band splitting that is constant for both directions at high temperature, but that diverges below the magnetic ordering temperature, as evident by comparison to the field-cooled d.c. magnetic susceptibility ( χ ) shown in i , measured in an applied field of H = 330 Oe ( H ⊥ c axis). The functional form of the susceptibility data here is a result of a net uncompensated ferromagnetic moment for the bulk magnetic structure of V 1/3 NbS 2 (ref. 9 ). Error bars in h reflect an approximate estimate of the uncertainty in extracting the underlying peak positions from the experimental measurements, incorporating statistical errors in peak fitting, systematic errors and experimental resolution. The greyscale colour bands indicate the measured ARPES intensity.
