Evidence for Crossed Andreev Reflections in bilayers of (100)YBCO and the itinerant ferromagnet SrRuO3

Abstract

Scanning tunneling spectroscopy measurements on thin epitaxial SrRuO3/(100)YBCO ferromagnet/superconductor bilayers, reveal localized regions in which the superconductor order parameter penetrates the ferromagnet to more than 26 nm, an order of magnitude larger than the coherence length in the ferromagnetic layer. These regions consist of narrow (< 10 nm) and long strips, separated by at least 200 nm, consistent with the known magnetic domain wall structure in SrRuO3. We attributed this behavior to Crossed Andreev Reflections, taking place in the vicinity of the magnetic domain walls.

arXiv commentsubmitted to PRL

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• Direct penetration of spin-triplet superconductivity into a ferromagnet in Au/SrRuO3/Sr2RuO4 junctions
• Efficient current-induced domain-wall displacement SrRuO3
• Electrically controlled crossed Andreev reflection in two-dimensional antiferromagnets
• Non-local transport in normal-metal/superconductor hybrid structures: the role of interference and interaction
• Adiabatic pumping in a double-dot Cooper-pair beam splitter
• Topological superconductivity and Majorana fermions in hybrid structures involving cuprate high-T_c superconductors
• Materials challenges for SrRuO3: from conventional to quantum electronics
• Proximity effect and its enhancement by ferromagnetism in high-temperature superconductor-ferromagnet structures
• Scanning tunneling spectroscopy study of c-axis proximity effect in epitaxial bilayer manganite/cuprate thin films
• Ferromagnetic SrRuO3 thin-film deposition on a spin-triplet superconductor Sr2RuO4 with highly conducting interface
• Long range crossed Andreev reflections in high Tc superconductors
• Penetration of Andreev bound states into the ferromagnet in a SrRuO${}_3$/(110)YBa${}_2$Cu${}_3$O${}_{7-\delta }$ bilayer: a scanning tunneling spectroscopy study
• Indication for macroscopic quantum tunneling below 10 K in nanostructures of SrRuO3
• 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
• Monitoring superparamagnetic Langevin behavior of individual $\mathrm{SrRu}{\mathrm{O}}_3$ nanostructures
• Interface effects in d-wave superconductor-ferromagnet junctions
• Anomalous anisotropic behaviour of spin-triplet proximity effect in Au/SrRuO${}_3$/Sr${}_2$RuO${}_4$ junctions