Effect of high density of states in the presence of interchain coupling on the transition temperature

The combination N(0)I² (N(0)-electronic density of states at the Fermi level, I²-electron-phonon coupling constant) is calculated in the tight-binding approximation for the δ₂ band of V₃Si. In this model the density of states can be very high even when strong interchain coupling is present. It is found that I² is almost insensitive to changes in the interchain coupling, and that a significant increase in N(0)I² of this model can be achieved only for low occupation numbers of the δ₂ band.