Angular dependence of superconductivity in superconductor/spin-valve heterostructures
Alejandro A. Jara, Christopher Safranski, Ilya N. Krivorotov, Chien-Te Wu, Abdul N. Malmi-Kakkada, Oriol T. Valls, Klaus Halterman
DOI 10.1103/PhysRevB.89.184502 · Physical Review B
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Abstract
We report measurements of the superconducting transition temperature, Tc, in CoO/Co/Cu/Co/Nb multilayers as a function of the angle α between the magnetic moments of the Co layers. Our measurements reveal that Tc(α) is a nonmonotonic function, with a minimum near α=π/2. Numerical self-consistent solutions of the Bogoliubov–de Gennes equations quantitatively and accurately describe the behavior of Tc as a function of α and layer thicknesses in these superconductor/spin-valve heterostructures. We show that experimental data and theoretical evidence agree in relating Tc(α) to enhanced penetration of the triplet component of the condensate into the Co/Cu/Co spin valve in the maximally noncollinear magnetic configuration.
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. | 2.92 | Pressure not reported | midpoint |
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