Journal Article

Anisotropy of spin-polarized transport in a ferromagnet/d-wave superconductor bilayer: Role of the small exchange field

Zorica Popović and Predrag Miranović

in Progress of Theoretical and Experimental Physics

Volume 2018, issue 4
Published online April 2018 | e-ISSN: 2050-3911 | DOI: https://dx.doi.org/10.1093/ptep/pty031

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Abstract

The current–voltage characteristic of a ferromagnet/[math]-wave superconductor (FD) bilayer is calculated as a function of the orientation of the superconductor crystallographic axes relative to the FD boundary by solving the spin-dependent Bogoliubov–de Gennes equations. We found that, regardless of the superconductor orientation, the conductance [math] always reaches a maximum when the bias voltage matches the exchange field in the ferromagnet, [math], providing that the exchange field is larger than the order parameter [math]. For small exchange fields, conductance [math], and zero-bias conductance [math] in particular, is more sensitive to the rotation of the superconductor crystallographic axis. Zero-bias conductance (ZBC) is isotropic in two limiting cases: when the exchange field in the ferromagnet is strong enough ([math]), and in the opposite case of normal metal ([math]) at [math]. In between these two extreme cases the low-temperature ZBC is anisotropic, and the anisotropy is most pronounced for [math]. The maximum of ZBC always occurs when the direction of the gap node is perpendicular to the FD boundary.

Keywords: I60; I64

Journal Article.  4692 words.  Illustrated.

Subjects: Condensed Matter Physics

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