INVERSE-PHOTOEMISSION FROM V, CR, MN, FE, AND CO MONOLAYERS ON AG(100)

Well ordered 1 X 1 monolayers of transition metals are grown on Ag(100 ) at 440 K. Using inverse photoemission we obtain the position of the unoccupied 3d states versus band filling. At k(parallel-to)=0 the mino rity-spin state of DELTA5 symmetry (d(xz,yz)) is found at 2.1, 1.6, 1. 4, 0.5, and 0.25 eV above the Fermi level for V, Cr, Mn, Fe, and Co mo nolayers. For V a majority-spin feature is observed at 0.7 eV. For the Cr monolayer we obtain a magnetic exchange splitting of 2.7 eV using previous photoemission results for the majority-spin state. This is 20 times as large as in bulk Cr, suggesting a strong enhancement of the local magnetic moment in the monolayer. Our results are consistent wit h first-principles calculations for the magnetic configurations with t he lowest energy, i.e., antiferromagnetic V, Cr, and Mn, and ferromagn etic Fe and Co monolayers on Ag(100).