Effects of self-interaction correction on momentum density in copper

The full-potential linearized APW (FLAPW) method is employed to find out ef fects of introducing the self-interaction correction (SIC) on the band stru cture, the Fermi surface geometry, electron wavefunctions and Compton profi les. Introduction of the SIC lowers and narrows the d bands. As the results , the theoretical Compton profiles are brought into a better agreement with the experimental profiles on one hand, and the area of the Fermi surface n eck at the L point becomes too small to explain the dHvA result on the othe r hand.