Triplet pairing states with equal spins in ferromagnet/superconductor heterojunctions for noncollinear magnetizations

Z. P. Niu (), Z. M. Zheng and D. Y. Xing

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 60, issue 3, 281-287

Abstract: Four-component Bogoliubov-de Gennes equations are applied to study tunneling conductance spectra of ferromagnet/ferromagnet/d-wave superconductor (F 1 /F 2 /d-wave S) tunnel junctions and to find out signs of spin-triplet pairing correlations induced in the proximity structure. The pairing correlations with equal spins arises from the novel Andreev reflection (AR), which requires at least three factors: the usual AR at the F 2 /S interface, spin flip in the F 2 layer, and superconducting coherence kept up in the F 2 layer. Effects of angle α between magnetizations of the two F layers, polarizations of the F 1 and F 2 layers, the thickness of the F 2 layer, and the orientation of the d-wave S crystal on the tunneling conductance are investigated. A conversion from a zero-bias conductance dip at α=0 to a zero-bias conductance peak at a certain value of α can be seen as a sign of generated spin-triplet correlations. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 74.45.+c Proximity effects; Andreev effect; SN and SNS junctions, 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects, 72.25.-b Spin polarized transport, (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00359-0

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