Proximity effect and its enhancement by ferromagnetism in high-temperature superconductor-ferromagnet structures

Abstract

We consider a bi-layer consisting of a $d-$wave layerd superconductor and diffusive ferromagnet with a domain wall (DW). The $c-$axis in the superconductor and DW in the ferromagnet are assumed to be perpendicular to the interface. We demonstrate that in such a heterostructure the inhomogeneous exchange field enhances the proximity effect. It is shown that, whereas in the absence of the exchange field the $d-$wave condensate decays in the normal metal on the mean free path $l$, the superconductivity penetrates the ferromagnet along the DW over much larger distances. This happens because the presence of DW results in a generation of an odd frequency triplet s-wave component of the condensate. The phenomenon discovered here may help to explain a recent experiment on high temperature superconductor-ferromagnet bi-lyers.

4 pages, 2 figures

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• Long range proximity effect in La2/3Ca1/3MnO3 (LCMO)/(100)YBa2Cu3O7-delta (YBCO) ferromagnet/superconductor bilayers: Evidence for induced triplet superconductivity in the ferromagnet
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• Topological superconductivity and Majorana fermions in hybrid structures involving cuprate high-T_c superconductors
• Spin-flip scattering and critical currents in ballistic half-metallic d-wave Josephson junctions
• Stray field and superconducting surface spin valve effect in La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$/YBa${}_2$Cu${}_3$O${}_{7-\delta }$ bilayers
• Critical current measurements in superconductor - ferromagnet - superconductor junctions of $YB{a}_{2}C{u}_3{O}_y$-$SrRu{O}_3$-$YB{a}_{2}C{u}_3{O}_y$: No evidence for a dominant proximity induced triplet superconductivity in the ferromagnetic barrier
• Interface effects in d-wave superconductor-ferromagnet junctions
• Transport and spectroscopic properties of superconductor - ferromagnet - superconductor junctions of $L{a}_{1.9}S{r}_{0.1}Cu{O}_4$ - $L{a}_{0.67}C{a}_{0.33}Mn{O}_3$ - $L{a}_{1.9}S{r}_{0.1}Cu{O}_4$
• Gapless Triplet Superconductivity in Magnetically Polarized Media