Pressure dependences of the elastic shear modulus and the lattice instability inV3Si

Abstract

The effects of a hydrostatic pressure on the shear modulus $C_s$ and the structural transition temperature $T_m$ of ${\mathrm{V}}_3$Si are studied on the basis of the Weger-Labbé-Friedel model with currently known parameters. Taking into account the charge transfer between $s$ and $d$ bands, our results can quantitatively account for the recent observations of Carcia and Barsch on $\frac{\partial C_s}{\partial P}$ and Chu and Testardi on $T_m$.