Upper critical field and transition temperature of superconducting/ferromagnetic superlattices

Koichi Kuboya; Kenji Takanaka

doi:10.1103/PhysRevB.57.6022

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Upper critical field and transition temperature of superconducting/ferromagnetic superlattices

Koichi Kuboya, Kenji Takanaka

DOI 10.1103/PhysRevB.57.6022 · Physical Review B

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Abstract

For dirty superconducting/ferromagnetic superlattices, we study theoretically the temperature dependence of the upper critical fields parallel Hc2‖, and perpendicular Hc2⊥, to the layers. Numerical results show that very thin ferromagnetic layers do not decouple the neighboring superconducting layers. We also study the superconducting transition temperature of the superlattices as a function of the thickness of the ferromagnetic layers. This shows nonmonotonic behavior under appropriate conditions which is due to the π-phase state which is peculiar to these systems. Additionally, we calculate the spatial variation of the pair function in order to interpret quantitatively the above results.