Are light alkali metals still metals under high pressure?

Details Are light alkali metals still metals under high pressure? Are light alkali metals still metals under high pressure?

1995-11-29

arxiv.org/abs/cond-mat/9512011v1

High Pressure Research, 15 (1997) 255

Physics

Condensed Matter

12 REVTeX pages + 1 PostScript figures in 1 uuencoded+ compressed+tarred format; subm. to Phys. Rev. Lett

Scientific paper

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.

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