Proximity effects, spin transport, and phase transitions in superconducting hybrids
Doctoral thesis
Permanent lenke
https://hdl.handle.net/11250/3072058Utgivelsesdato
2023Metadata
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- Institutt for fysikk [2653]
Sammendrag
This thesis presents our work on the theory of spin-dependent effects and transport in heterostructures involving superconductors, magnets, and non-centrosymmetric materials. The results are roughly divided into those concerning i) the superconducting phase transition and its influence on adjacent materials, and ii) spin transport. Our study of the superconducting phase transition is focused around spin-valve effects where the superconducting critical temperature can be controlled by the magnetic configuration or inversion symmetry breaking in materials in proximity to the superconductor. We also consider the reciprocal effect where decreasing the temperature below the superconducting transition temperature alters the magnetic anisotropy of an adjacent magnet. Furthermore, we consider how the superconducting critical temperature of an unconventional p-wave superconductor can be enhanced by proximity-coupling it via a ferromagnetic interlayer to a conventional superconductor with a higher critical temperature. Finally, we study the magnetic field-driven superconducting transition in a highly disordered hole-overdoped d-wave cuprate superconductor where superconducting pairing remains above the critical field where phase coherence is lost. Our work on spin transport includes the study of both dissipationless Cooper pair and resistive quasi-particle transport. We predict that due to interfacial exchange coupling, a supercurrent of spin-polarized Cooper pairs can induce a non-reciprocity in the magnon dispersion of a ferromagnetic insulator giving rise to magnon spin currents. We also study how non-equilibrium quasi-particle transport is affected by the pairing symmetry of the superconductor, how the inverse spin-Hall effect and spin-swapping are renormalized by a spin-splitting field, and how the coupling between two ferromagnetic insulators can be mediated by a superconductor thus affecting spin-pumping.
Består av
Paper 1: González-Ruano, César; Johnsen, Lina G.; Caso, Diego; Tiusan, Coriolan; Hehn, Michel; Banerjee, Niladri; Linder, Jacob; Aliev, Farkhad G.. Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction. Physical review B (PRB) 2020 ;Volum 102.(2) Suppl. https://journals.aps s. – Copyright ©2020 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevB.102.020405Paper 2: Johnsen, Lina G.; Svalland, Kristian; Linder, Jacob. Controlling the Superconducting Transition by Rotation of an Inversion Symmetry-Breaking Axis. Physical Review Letters 2020 ;Volum 125.(10) s. - © 2020 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevLett.125.107002
Paper 3: Simensen, Haakon Thømt; Johnsen, Lina G.; Linder, Jacob; Brataas, Arne. Spin pumping between noncollinear ferromagnetic insulators through thin superconductors. Physical review B (PRB) 2021 ;Volum 103.(2) s. -© 2021 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevB.103.024524
Paper 4: Johnsen, Lina G.; Jacobsen, Sol; Linder, Jacob. Magnetic control of superconducting heterostructures using compensated antiferromagnets. Physical review B (PRB) 2021 ;Volum 103.(6) s. - ©2021 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevB.103.L060505
Paper 5: González-Ruano, César; Caso, Diego; Johnsen, Lina G.; Tiusan, Coriolan; Hehn, Michel; Banerjee, Niladri; Linder, Jacob; Aliev, Farkhad G.. Superconductivity assisted change of the perpendicular magnetic anisotropy in V/MgO/Fe junctions. Scientific Reports 2021 ;Volum 11. s. - Open Access This article is licensed under a Creative Commons Attribution 4.0 International License. Available at http://dx.doi.org/10.1038/s41598-021-98079-5
Paper 6: Johnsen, Lina G.; Linder, Jacob. Spin injection and spin relaxation in odd-frequency superconductors. Physical review B (PRB) 2021 ;Volum 104.(14) s. - ©2021 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevB.104.144513
Paper 7: Johnsen, Lina G.; Simensen, Haakon Thømt; Brataas, Arne; Linder, Jacob. Magnon Spin Current Induced by Triplet Cooper Pair Supercurrents. Physical Review Letters 2021 ;Volum 127.(20) s. - © 2021 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevLett.127.207001
Paper 8: Olthof, Linde A. B. Olde; Johnsen, Lina G.; Robinson, Jason W.A.; Linder, Jacob. Controllable Enhancement of p-Wave Superconductivity via Magnetic Coupling to a Conventional Superconductor. Physical Review Letters 2021 ;Volum 127.(26) s. -© 2021 American Physical Society. Available at: http://dx.doi.org/10.1103/PhysRevLett.127.267001.
Paper 9: Johnsen, Lina G.. The magnetic field driven superconductor-metal transition in disordered hole-overdoped cuprates. Journal of Physics: Condensed Matter 2023 ;Volum 35.(11) s. - © 2023 IOP Publishing Ltd. Available at: http://dx.doi.org/10.1088/1361-648X/acaf1e
Paper 10: Chourasia, Simran; Kamra, Lina Johnsen; Bobkova, Irina V.; Kamra, Akashdeep. Generation of spin-triplet Cooper pairs via a canted antiferromagnet Available at https://doi.org/10.48550/arXiv.2303.18145
Paper 11: Kamra, Lina Johnsen; Linde, Jacob. Inverse spin-Hall effect and spin-swapping in spin-split superconductors. This paper is under preparation and not yet published and is therefore not included.