Ratio 2Δ0/kTc in superconductivity
Daniel C. Mattis, Mario Molina
DOI 10.1103/PhysRevB.44.12565 · Physical Review B
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Abstract
In high-temperature superconductors, values of the ratio R=2Δ0/kTc have been reported in the range 2–10, whereas low-temperature superconductors rarely deviate by as much as 50% from the BCS prediction R=3.54. Could this variability relate to the density of states near the Fermi surface? Our calculations answer this in the negative.
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