The Fermi surface dimensions of disordered Cu 3Au as determined by angle resolved photoemission spectroscopy

Abstract

The bulk Fermi surface of the disordered phase of Cu 3Au has been experimentally mapped using angle resolved constant initial state (CIS) photoemission spectroscopy. The shape of the Fermi surface in the (11 2 ) plane has been determined using only those transitions which could be identified from the Fermi surface to primary cone free electron bands. A Fourier series formula, using a linear combination of coefficients for the Fermi surfaces of Cu and Au has been found to be in good agreement with the experimentally determined Fermi surface of disordered Cu 3Au. Furthermore, the neck radius, determined absolutely in k-space, was found to be smaller than the neck radius of Cu by ∼ 10%; a difference which may be explained by the presence of Au and the sensitivity of the neck region to changes in the crystal potential.