ELECTRONIC-STRUCTURE AND MAGNETISM OF THE RH(001) SURFACE

Spin-polarized-photoemission experiments on clean Rh{001} show that the surface resonance at the MBAR point (0.60 eV binding energy) in the surface Brillouin zone is weakly ferromagnetic at room temperature. The effect increases with decreasing temperature of the surface and disappears when the surface is covered with 0.5 layer of oxygen. The spin- and angle-resolved photoemission spectra exhibit very small exchange splitting, hence the magnetic moment of the surface atoms cannot be reliably determined, but is estimated to lie between 0.1mu(B) and 0.2mu(B).