We present photoemission results on the Zn-Pd system (∼88 at.% Zn) which show a pronounced modification of the $d$-band density of states after cooling to ∼ 85 K. The Zn $3d$ peak increases, clearly showing a segration of Zn at the surface upon cooling; a modification of Pd $4d$ density of states takes place in the mean time with a sharpening of the $4d$ peak. The interpretation of this last result is still open to controversy. Results for 0.1 monolayer of Pd on Zn(0001) are also given.

• Received 30 April 1982

DOI:https://doi.org/10.1103/PhysRevB.26.4749