Are light alkali metals still metals under high pressure?
Condensed Matter
2007-05-23 v1
Abstract
The extended Hubbard Hamiltonian on a bcc lattice is studied at half-filling and for a finite hopping between next-nearest-neighbours, in mean-field approximation. An ionic insulating broken-symmetry phase is predicted for any hydrogenoid bcc solid in the density range 1.0 < r sub s < 2.6. The occurrence of an ionic phase would explain the failure to achieve hydrogen metallization at high pressures. Moreover, a metal-insulator transition is expected for sodium in the 100 GPa region.
Keywords
Cite
@article{arxiv.cond-mat/9512011,
title = {Are light alkali metals still metals under high pressure?},
author = {Fabio Siringo and Renato Pucci and Giuseppe G. N. Angilella},
journal= {arXiv preprint arXiv:cond-mat/9512011},
year = {2007}
}
Comments
12 REVTeX pages + 1 PostScript figures in 1 uuencoded+ compressed+tarred format; subm. to Phys. Rev. Lett