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Josephson effect and spin-triplet pairing correlations in SF1F2S junctions

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arxiv 1103.0293 v2 pith:YQFHQ2PP submitted 2011-03-01 cond-mat.supr-con

Luka Trifunovic , Zorica Popovic , Zoran Radovic This is my paper · ORCID
classification cond-mat.supr-con
keywords correlationsjosephsonjunctionseffectferromagnetssf1f2sspin-tripletcurrent-phase
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We study theoretically the Josephson effect and pairing correlations in planar SF1F2S junctions that consist of conventional superconductors (S) connected by two metallic monodomain ferromagnets (F1 and F2) with transparent interfaces. We obtain both spin-singlet and -triplet pair amplitudes and the Josephson current-phase relations for arbitrary orientation of the magnetizations using the self-consistent solutions of Eilenberger equations in the clean limit and for a moderate disorder in ferromagnets. We find that the long-range spin-triplet correlations cannot prevail in symmetric junctions with equal ferromagnetic layers. Surprisingly, the long-range spin-triplet correlations give the dominant second harmonic in the Josephson current-phase relation of highly asymmetric SF1F2S junctions. The effect is robust against moderate disorder and variations in the layers thickness and exchange energy of ferromagnets.

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  1. Quantized resonant tunneling effect in Josephson junctions with ferromagnetic bilayers

    cond-mat.supr-con 2025-04 conditional novelty 6.0 of 10

    In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting t...

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