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Superconducting order parameter in heavily overdoped $Bi_2 Sr_2 Ca Cu_2 O_{8+\delta}$: a global quantitative analysis
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cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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analysisdeltaheavilyorderoverdopedparametercacucoherent
abstract
A systematic analysis of the complex lineshape at $(\pi,0)$ of heavily overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ 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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