Theory of high-TC superconductivity: Transition temperature

Document Type

Article

Publication Date

7-27-2011

Abstract

It is demonstrated that the transition temperature (TC) of high-TC superconductors is determined by their layered crystal structure, bond lengths, valency properties of the ions, and Coulomb coupling between electronic bands in adjacent, spatially separated layers. Analysis of 31 high-TC materials (cuprates, ruthenates, ruthenocuprates, iron pnictides, organics) yields the universal relationship for optimal compounds, kBTC0=β/ℓζ, where ℓ is related to the mean spacing between interacting charges in the layers, ζ is the distance between interacting electronic layers, β is a universal constant and T C0 is the optimal transition temperature (determined to within an uncertainty of ±1.4K by this relationship). Non-optimum compounds, in which sample degradation is evident, e.g.by broadened superconducting transitions and diminished Meissner fractions, typically exhibit reduced T C < TC0. It is shown that TC0 may be obtained from an average of the Coulomb interaction forces between the two layers. © 2011 IOP Publishing Ltd.

Identifier

79960641150 (Scopus)

Publication Title

Journal of Physics Condensed Matter

External Full Text Location

https://doi.org/10.1088/0953-8984/23/29/295701

e-ISSN

1361648X

ISSN

09538984

Issue

29

Volume

23

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