Origin of asymmetry of the EFG in cubic metal alloys

Unlike the earlier works, which assume the impurity-induced electron density δn to be spherically symmetric, we have taken δn to have the more realistic cubic symmetry. The corresponding valence EFG q^v shows the interesting property of non-axial symmetry along the [110] direction. Contrary to earlier assumptions, this reveals that the size EFG is not the only source for the asymmetry of the EFG in cubic metal alloys.