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Effect of Pressure on Superconducting Properties

  • Sven Larsson
Original Paper

Abstract

It is shown that the existence of superconductivity in a material, and its critical temperature, depends strongly on pressure. Several parameters are pressure-dependent: (1) structure, particularly bond distances, (2) Hubbard U, (3) coupling between sites, and (4) orbital occupation number. Eliashberg theory often leads to incorrect predictions, for example in A3C60 with A = K, Rb, and Cs. While T C is correctly predicted to be higher for Rb3C60 than for K3C60 and decreasing with pressure in both cases, Cs3C60 is not superconducting at ambient pressure. The same is the case for pure metals such as Cs and Ca (superconducting at high pressure). A theory for electron pairs, similar to the Marcus model for single electrons, appears to agree with the experiment in most cases.

Keywords

Superconductivity Pressure Marcus model Negative Hubbard U Missing oxidation state Fullerene Occupation Localization 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of ChemistryChalmers Institute of TechnologyGothenburgSweden

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