Knight shift anomalies in heavy electron materials

n this dissertation, we studied the Knight shift and the magnetic susceptibility of the heavy electron materials to understand the origin of the Knight shift anomaly which exist in some heavy electron system. We used the infinite U Andersen model within the NCA method.;We systematically studied the Knight, shift ;We carry out the incoherent lattice sum by adding the Knight shift of a few hundred shells of impurity atoms around the nucleus and compare the numerically calculated results with the experimental results. For CeSn;The calculated magnetic susceptibility and ;For YbCuAl, the measured ;For proposed quadropolar Kondo alloy ;Ours is the first study to display low temperature Knight shift anomaly in a realistic impurity model calculation. In our calculation we can explain that the Knight shift anomaly in heavy electron materials with the simplified single impurity Kondo effect. There exists the Knight shift anomaly at short distance...