EXPERIMENTAL AND THEORETICAL INVESTIGATIONS OF THE KNIGHT-SHIFT OF PDAND AG IN THE ALLOY SYSTEM AGXPD1-X

The Knight shift of Pd in AgxPd1-x has been determined for concentrati ons x less-than-or-equal-to 0.2. In full accordance with the expectati ons based on the behaviour of the magnetic susceptibility, it was foun d that the Knight shift of Pd is rapidly reduced in magnitude by addin g Ag to Pd. To allow for a detailed interpretation of this finding, we have performed Korringa-Kohn-Rostoker coherent potential approximatio n (KKR-CPA) band structure calculations for AgxPd1-x. These calculatio ns clearly demonstrate that the decrease in spin susceptibility with i ncreasing x is accompanied with a decrease in core polarization. In co ntrast to Pd, the negative Knight shift of Ag on the Pd-rich side of t he system is caused by the valence band contribution, as it is demonst rated by our calculations. This is caused by an intersite effect in an alogy to the transferred hyperfine field found for non-magnetic elemen ts dissolved in a magnetic host.