Theoretical predictions of superconductivity in alkali metals under high pressure
Lei Shi, D. A. Papaconstantopoulos
DOI 10.1103/PhysRevB.73.184516 · Physical Review B
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Abstract
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 5–20K. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | 20 GPa | unknown |
| Cs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | 7 GPa | unknown |
| Li Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | 15 GPa | unknown |
| Cs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | 3.5 GPa | unknown |
| Rb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | 7 GPa | unknown |
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