NDLI: Effect of Pressure on Superconducting Properties

Content Provider	Springer Nature Link
Author	Larsson, Sven
Copyright Year	2015
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 A$_{3}$C$_{60}$ with A = K, Rb, and Cs. While T $_{C}$ is correctly predicted to be higher for Rb$_{3}$C$_{60}$ than for K$_{3}$C$_{60}$ and decreasing with pressure in both cases, Cs$_{3}$C$_{60}$ 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.
Starting Page	1693
Ending Page	1698
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	28
Issue Number	6
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2015-02-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Superconductivity Pressure Marcus model Negative Hubbard U Missing oxidation state Fullerene Occupation Localization Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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