Charge transport through spin-polarized tunnel junction between two spin-split superconductors
Rouco, M., Chakraborty, S., Aikebaier, F., Golovach, V. N., Strambini, E., Moodera, J. S., Giazotto, F., Heikkilä, T. T., & Bergeret, F. S. (2019). Charge transport through spin-polarized tunnel junction between two spin-split superconductors. Physical Review B, 100(18), Article 184501. https://doi.org/10.1103/PhysRevB.100.184501
Published inPhysical Review B
© 2019 American Physical Society
We investigate transport properties of junctions between two spin-split superconductors linked by a spin-polarized tunneling barrier. The spin-splitting fields in the superconductors (S) are induced by adjacent ferromagnetic insulating (FI) layers with arbitrary magnetization. The aim of this study is twofold. On the one hand, we present a theoretical framework based on the quasiclassical Green's functions to calculate the Josephson and quasiparticle current through the junctions in terms of the different parameters characterizing it. Our theory predicts qualitative new results for the tunneling differential conductance, dI/dV, when the spin-splitting fields of the two superconductors are noncollinear. We also discuss how junctions based on FI/S can be used to realize anomalous Josephson junctions with a constant geometric phase shift in the current-phase relation. As a result, they may exhibit spontaneous triplet supercurrents in the absence of a phase difference between the S electrodes. On the other hand, we show results of planar tunneling spectroscopy of a EuS/Al/AlOx/EuS/Al junction and use our theoretical model to reproduce the obtained dI/dV curves. Comparison between theory and experiment reveals information about the intrinsic parameters of the junction, such as the size of the superconducting order parameter, spin-splitting fields and spin relaxation, and also about properties of the two EuS films, such as their morphology, domain structure, and magnetic anisotropy. ...
PublisherAmerican Physical Society
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Academy Project, AoF; Others, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work was supported by EU’s Horizon 2020 research and innovation program under Grant Agreement No. 800923 (SUPERTED). M.R., V.N.G., and F.S.B., acknowledge financial support by the Spanish Ministerio de Ciencia, Innovacion y Universidades through the Projects No. FIS2014-55987-P and No. FIS2017-82804-P and by the grant “Grupos Consolidados UPV/EHU del Gobierno Vasco” (Grant No. IT1249- 19). E.S. and F.G acknowledge partial financial support from the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant No. 615187- COMANCHE, and by the Tuscany Region under the FARFAS 2014 Project SCIADRO. S.C, F.A, and T.T.H. acknowledge support from the Academy of Finland (Key Funding Projects No. 305256 and No. 317118). The work of JSM at MIT was supported by NSF Grant No. DMR-1700137, ONR Grant No. N00014-16- 1-2657, and ARO Grant No. W911NF1920041. ...
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