Symmetry breaking and restoring under high pressure: the amazing behaviour of the "simple" alkali metals

Details Symmetry breaking and restoring under high pressure: the amazing behaviour of the "simple" alkali metals Symmetry breaking and restoring under high pressure: the amazing behaviour of the "simple" alkali metals

2002-07-02

arxiv.org/abs/cond-mat/0207066v2

Eur. Phys. J. B 32 (2003) 323

Physics

Condensed Matter

Materials Science

accepted in Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2003-00105-8

We argue that an ionic lattice surrounded by a Fermi liquid changes phase several times under pressure, oscillating between the symmetric phase and a low-symmetry dimerized structure, as a consequence of Friedel oscillations in the pair potential. Phase oscillations explain the tendency towards dimerization which has been recently reported for the light alkali metals under high pressure. Moreover, a restoring of the symmetric phase is predicted for such elements at an even higher density.

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