Superconducting order parameter in heavily overdoped Bi2 Sr2 Ca Cu2 O8+δ: a global quantitative analysis
Abstract
A systematic analysis of the complex lineshape at (π,0) of heavily overdoped Bi2Sr2CaCu2O8+δ is presented. We show that a coherent component in the quasi-particle excitation is correlated with the superfluid density throughout the entire doping range and suggest it is a direct measure of the order parameter of high temperature superconductors.
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