Thermodynamic properties of metals when the Fermi surface is close to Brillouin zone surfaces
Vaks V. G., Trefilov A. V.
The pseudopotential-theory formulas for the energy of a metal are generalized to the case in which the Fermi surface lies a short distance ζ from Brillouin zone surfaces. The anomalous features in the shear modulus, the heat capacity, and the coefficient of thermal expansion as functions of ζ may be very sharp in this region, while those in the bulk modulus are much weaker.