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Observation of spin-triplet superconductivity in Co-based Josephson Junctions

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arxiv 0912.0205 v1 pith:KSZTXLLK submitted 2009-12-01 cond-mat.supr-con cond-mat.mes-hall

Trupti S. Khaire , Mazin A. Khasawneh , W. P. Pratt , Jr. , Norman O. Birge This is my paper · ORCID
classification cond-mat.supr-concond-mat.mes-hall
keywords junctionsalloydecaysferromagneticjosephsonlayerslong-rangespin-triplet
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We have measured a long-range supercurrent in Josephson junctions containing Co (a strong ferromagnetic material) when we insert thin layers of either PdNi or CuNi weakly-ferromagnetic alloys between the Co and the two superconducting Nb electrodes. The critical current in such junctions hardly decays for Co thicknesses in the range of 12-28 nm, whereas it decays very steeply in similar junctions without the alloy layers. The long-range supercurrent is controllable by the thickness of the alloy layer, reaching a maximum for a thickness of a few nm. These experimental observations provide strong evidence for induced spin-triplet pair correlations, which have been predicted to occur in superconducting/ferromagnetic hybrid systems in the presence of certain types of magnetic inhomogeneity.

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

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    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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