Theoretical Predictions of Superconductivity in Alkali Metals under High Pressure

Details Theoretical Predictions of Superconductivity in Alkali Metals under High Pressure Theoretical Predictions of Superconductivity in Alkali Metals under High Pressure

2005-09-30

arxiv.org/abs/cond-mat/0509812v2

Physics

Condensed Matter

Superconductivity

6 pages, 8 figures

Scientific paper

10.1103/PhysRevB.73.184516

We calculated the superconductivity properties of alkali metals under high pressure using the results of band theory and the rigid-muffin-tin theory of Gaspari and Gyorffy. Our results suggest that at high pressures Lithium, Potassium, Rubidium and Cesium would be superconductors with transition temperatures approaching $5-20 K$. Our calculations also suggest that Sodium would not be a superconductor under high pressure even if compressed to less than half of its equilibrium volume. We found that the compression of the lattice strengthens the electron-phonon coupling through a delicately balanced increase of both the electronic and phononic components of this coupling. This increase of the electron-phonon coupling in Li is due to an enhancement of the $s$-$p$ channel of the interaction, while in the heavier elements the $p$-$d$ channel is the dominant component.

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