Evidence for Zero- and π-Phase Order Parameters of Superconducting Nb/Co Tri- and Pentalayers from the Oscillatory Behavior of the Transition Temperature

Y. Obi; M. Ikebe; H. Fujishiro

doi:10.1103/PhysRevLett.94.057008

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Evidence for Zero- and π-Phase Order Parameters of Superconducting Nb/Co Tri- and Pentalayers from the Oscillatory Behavior of the Transition Temperature

Y. Obi, M. Ikebe, H. Fujishiro

DOI 10.1103/PhysRevLett.94.057008 · Physical Review Letters

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Abstract

The oscillation behavior of the superconducting transition temperature Tc as a function of the ferromagnetic Co layer thickness (dCo) has been examined for Nb/Co superconductor(S)/ferromagnetic(F) trilayer series (F/S/F) and pentalayer series (F/S/F/S/F). Tc of the pentalayer series takes a local maximum between dCo=2.0–3.2 nm, where Tc of the trilayer shows a local minimum. This difference in the Tc versus dCo curves provides a clear evidence for the occurrence of the π phase in the pentalayers, which has been theoretically predicted by Buzdin et al., Radović et al., and Tagirov.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	midpoint