Strongly Enhanced Magnetic Moments of Vanadium Impurities in Thin Films of Sodium and Potassium

Thin quench-condensed films of Na and K are covered with $1/100$ of a monolayer of V. Then the impurities are covered with several atomic layers of the host. The magnetization of the films is measured by means of the anomalous Hall effect. For V impurities on the surface of Na and K, a magnetic moment of 7 Bohr magnetons is observed. After coverage with the host, the V moment became $6.5{\mu }_B$ for the Na host. These results contradict the favored atomic model (predicting $\frac{3}{5}{\mu }_B$) and the resonance model. A polarization of the alkali host appears to be the only resolution.