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Effect of Pressure on Superconducting Properties

Sven Larsson (Institutionen för kemi och kemiteknik, Fysikalisk kemi)
Journal of Superconductivity and Novel Magnetism (1557-1939). Vol. 28 (2015), 6, p. 1693-1698.
[Artikel, refereegranskad vetenskaplig]

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 A(3)C(60) 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.

Nyckelord: Superconductivity, Pressure, Marcus model, Negative Hubbard U, Missing oxidation state, Fullerene

Denna post skapades 2015-06-09. Senast ändrad 2016-11-07.
CPL Pubid: 218129


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Institutionen för kemi och kemiteknik, Fysikalisk kemi



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