Abstract
Spin-polarized supercurrents can be generated with magnetic inhomogeneity at a ferromagnet/spin-singlet-superconductor interface. In such systems, complex magnetic inhomogeneity makes it difficult to functionalise the spin-polarized supercurrents. However, spin-polarized supercurrents in ferromagnet/spin-triplet-superconductor junctions can be controlled by the angle between magnetization and spin of Copper pairs (d-vector), that can effectively be utilized in developing of a field of research known as superconducting spintronics. Recently, we found induction of spin-triplet correlation into a ferromagnet SrRuO3 epitaxially deposited on a spin-triplet superconductor Sr2RuO4, without any electronic spin-flip scattering. Here, we present systematic magnetic field dependence of the proximity effect in Au/SrRuO3/Sr2RuO4 junctions. It is found that induced triplet correlations exhibit strongly anisotropic field response. Such behaviour is attributed to the rotation of the d-vector of Sr2RuO4. This anisotropic behaviour is in contrast with the vortex dynamic. Our results will stimulate study of interaction between ferromagnetism and unconventional superconductivity.
Highlights
Generation of dissipationless spin-polarized supercurrent is the major interest of superconducting devices, which can be utilized to establish energy efficient superconducting spintronics[1,2]
We present the results of various junctions but mainly focus on two junctions J4 and J5 that exhibit different normal-state resistance (RN) 7.83 m Ω and 198 m Ω, respectively
We studied long-range proximity effect in Au/SRO113/SRO214 double barrier junctions
Summary
Generation of dissipationless spin-polarized (spin-triplet) supercurrent is the major interest of superconducting devices, which can be utilized to establish energy efficient superconducting spintronics[1,2]. Complicated magnetic structure of multilayer ferromagnets makes it hard to functionalize the F/SSC devices This issue can be settled by replacing SSC with a spin-triplet superconductor (TSC). Sr2RuO4 (SRO214) is one of the best-candidates of TSCs19 with the superconducting critical temperature (Tc) of 1.5 K Most likely, it exhibits the chiral p-wave spin-triplet state with broken time-reversal symmetry[20,21,22,23,24,25,26,27,28], there are still unresolved issues[29,30,31]. We should comment that the very recent nuclear magnetic resonance (NMR) study shows the reduction of Knight shift, which cannot be explained by a simple chiral-p-wave spin-striplet scenario[32,33] Such a chiral-p-wave superconductivity in, SRO214 attracts interest for exploring topological superconducting phenomena originating from its orbital phase winding[19,26,27,28]. This anisotropic effect can be attributed to the relative orientation of the d-vector of SRO214 and m of SRO113
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