Triplet proximity effect in FSF trilayers

TL;DR

This paper investigates how the critical temperature of FSF trilayers is affected by the generation of triplet superconductivity due to noncollinear magnetizations, using numerical and analytical methods to identify conditions for odd triplet pairing.

Contribution

It provides an exact numerical approach to calculate T_c in FSF trilayers and analytically explores limiting cases, advancing understanding of triplet superconductivity in multilayers.

Findings

Triplet component is generated at noncollinear magnetizations.

Conditions for odd triplet superconductivity are identified.

Critical temperature depends on magnetization orientation.

Abstract

We study the critical temperature T_c of FSF trilayers (F is a ferromagnet, S is a singlet superconductor), where the triplet superconducting component is generated at noncollinear magnetizations of the F layers. An exact numerical method is employed to calculate T_c as a function of the trilayer parameters, in particular, mutual orientation of magnetizations. Analytically, we consider limiting cases. Our results determine conditions which are necessary for existence of recently investigated odd triplet superconductivity in SF multilayers.