ASPHERICITY IN THE FERMI-SURFACE OF ALUMINUM AND LEAD

A detailed study of asphericity in the Fermi surface of aluminium (Al) and lead (Pb) along three symmetry directions [100], [110] and [111] is made on the basis of pseudopotential theory extending upto second o rder. The influence of exchange and correlation effects on the aspheri city in the Fermi surface is examined explicitly by using four differe nt forms of screening function. For polyvalent metals Al and Pb the di stortion in the Fermi surface is found to be sensitive in regard to va rious local field corrections. Copyright (C) 1996 Elsevier Science Ltd