and potassium lms

Abstract. Thin quench-condensed lms of Rb and K are covered with 1/100 of a mono-layer of Fe or Co. Then the impurities are covered with several atomic layers of the host. The magnetization of the lms is measured by means of the anomalous Hall eect (AHE). The magnetization follows a Brillouin function with a magnetic moment of more than 10 Bohr magnetons for bulk Co and Fe impurities. These moments are much larger than the moments of the atomic congurations of Fe and Co and suggest enhanced magnetic moments of the impurities. PACS. 75.20.Hr Local moment in compounds and alloys; Kondo eect, valence fluctuations, heavy fermions { 71.20.Dg Alkali and alkaline earth metals { 73.50.-h Electronic transport phenomena in thin lms The alkali metals are rather distinct from all other met-als in the periodic system. For one thing they are very open metals, i.e. the volume of the alkali ions take only a small fraction of the total metal volume. Furthermore the Coulomb interaction plays an important role in the alkali metals. This has been studied in particular for Cs, which has the smallest electron concentration of any metalli