Angle-resolved photoemission from Cr(110): Observation of a bulk magnetic phase transition

Normal-emission photoelectron spectra were recorded from Cr(110) at 80 K (below the Néel temperature of $T_N$=312 K) with photon energies from 20 to 120 eV. Assuming a free-electron final band, bulk energy-band dispersions along the [110] (ΓM) direction normal to the surface are determined. The results are compared with previously calculated band structures for the antiferromagnetic phase. Contrary to earlier claims, we find no evidence for a valence-band satellite in Cr. Temperature-dependent studies were also presented that reveal the disappearance of an emission from the ${\Sigma }_3$ initial-state band (corresponding to the $G_3$ band in the paramagnetic phase) at temperatures above $T_N$ for a specific k region. This result is discussed in terms of the bulk magnetic phase transition.