Spin polarized transport in the weak-link between $f$-wave superconductors

TL;DR

This paper theoretically investigates spin and charge currents in a Josephson junction between misoriented triplet superconductors, revealing conditions where spin current peaks while charge current vanishes, driven by gap vector misorientation.

Contribution

It provides analytical and numerical analysis of spin and charge transport in $UPt_{3}$-based triplet superconductor junctions, highlighting the role of gap vector misorientation.

Findings

Maximum spin current occurs when charge current is zero.

Spin current is caused by misorientation of gap vectors.

Charge and spin currents depend on phase difference and misorientation angle.

Abstract

The spin current in the Josephson junction as a weak link (interface) between misorientated triplet superconductors is investigated theoretically for the models of the order parameter in $UPt_{3}$. Green functions of the system are obtained from the quasiclassical Eilenberger equations. The analytical results for the charge and spin currents are illustrated by numerical calculations for the certain misorientation angles of gap vector of superconductors. As the main result of this paper, it is found that, at some values of the phase difference, at which the charge current is exactly zero, the spin current has its maximum value. Furthermore, it is shown that the origin of spin current is the misorientation between gap vectors of triplet superconductors.