Physics – Condensed Matter – Superconductivity
Scientific paper
2012-02-01
J. Phys.: Condens. Matter 23, 295701 (2011)
Physics
Condensed Matter
Superconductivity
28 pages, 147 references, 5 figures, 2 tables
Scientific paper
10.1088/0953-8984/23/29/295701
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, rutheno-cuprates, iron pnictides, organics) yields the universal relationship for optimal compounds, kBTc0 = {\beta}/\ell{\zeta}, where \ell is related to the mean spacing between interacting charges in the layers, {\zeta} is the distance between interacting electronic layers, {\beta} is a universal constant and Tc0 is the optimal transition temperature (determined to within an uncertainty of +/- 1.4 K 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 Tc < Tc0. It is shown that Tc0 may be obtained from an average of Coulomb interaction forces between the two layers.
Dow John D.
Fiory Anthony T.
Harshman Dale R.
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