Pressure induced complexity in a lithium monolayer

Details Pressure induced complexity in a lithium monolayer Pressure induced complexity in a lithium monolayer

2005-01-26

arxiv.org/abs/cond-mat/0501646v2

Phys. Rev. B 72, 125406 (2005)

Physics

Condensed Matter

Materials Science

5 pages and 10 figures

Scientific paper

10.1103/PhysRevB.72.125406

Light alkali metals have usually been considered as simple metals due to their monovalency and high conductivity. In these metals ionic pseudopotentials are weak and the nearly free electron model (NFE) becomes quite accurate at normal conditions. However, very recent experiments have shown that at high pressures their electronic properties deviate radically from the NFE model and even become unexpected good superconductors. In this work we present ab initio calculations to analyze the deviation from simplicity in a lithium monolayer (ML) when pressure is applied. We have seen that as a result of the increasing non-local character of the atomic pseudopotential with increasing pressure, the surprising half filling Hubbard-type nesting observed in the Fermi line can explain the interesting complex behavior in lithium ML, induced by its correlated structural, electronic and even magnetic properties.

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