Proximity Effect in Nb/Au/CoFe Trilayers

Details Proximity Effect in Nb/Au/CoFe Trilayers Proximity Effect in Nb/Au/CoFe Trilayers

2005-04-21

arxiv.org/abs/cond-mat/0504544v1

Physics

Condensed Matter

Superconductivity

25 pages, 6 figures

Scientific paper

10.1103/PhysRevB.71.214519

We have investigated the superconducting critical temperatures of Nb/Au/CoFe trilayers as a function of Au and CoFe thicknesses. Without the CoFe layer the superconducting critical temperatures of Nb/Au bilayers as a function of Au thickness follow the well-known proximity effect between a superconductor and a normal metal. The superconducting critical temperatures of Nb/Au/CoFe trilayers as a function of Au thickness exhibit a rapid initial increase in the small Au thickness region and increase slowly to a limiting value above this region, accompanied by a small oscillation of Tc. On the other hand, the superconducting critical temperatures of Nb/Au/CoFe trilayers as a function of CoFe thickness show non-monotonic behavior with a shallow dip feature. We analyzed the Tc behavior in terms of Usadel formalism and found that most features are consistent with the theory, although the small oscillation of Tc as a function of the Au thickness cannot be accounted for. We have also found quantitative values for the two interfaces: Nb/Au and Au/CoFe.

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