BIFURCATIONS IN CUBIC-CRYSTALS UNDER HYDROSTATIC-PRESSURE

Post-bifurcation phenomena accompanying the branching of cubic crystal s under hydrostatic pressure at instabilities associated with the vani shing of shear moduli are studied analytically and computationally. It is shown that pseudopotential models of the alkali metals exhibit bra nching from cubic to tetragonal configurations, and furthermore, that is the only branching geometry that may occur homogeneously under a st rict hydrostatic environment when the shear modulus mu vanishes. Copyr ight (C) 1996 Elsevier Science Ltd