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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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arxiv cond-mat/0402247 v2 pith:NABG2C5D submitted 2004-02-09 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords analysisdeltaheavilyorderoverdopedparametercacucoherent
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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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