Electron correlation and magnetic properties ofc(2×2)CuMn∕Cu(001)two-dimensional surface alloys

Abstract

We have deduced a local magnetic susceptibility from the temperature dependence of $\mathrm{Mn}\phantom{\rule{0.2em}{0ex}}{L}_{23}$ soft x-ray magnetic circular dichroism spectra of $c(2\ifmmode\times\else\texttimes\fi{}2)$ $\mathrm{Cu}\mathrm{Mn}∕\mathrm{Cu}(001)$ two-dimensional ordered surface alloy. The higher temperature magnetic susceptibility above $\ensuremath{\sim}40\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ obeys the Curie-Weiss law, suggesting that the surface alloy is in a paramagnetic phase. The deduced spin magnetic moment from the temperature dependence of the local magnetic susceptibility is found to be highly suppressed from the predicted value.