Nodal superconducting exchange coupling

Abstract

The superconducting equivalent of giant magnetoresistance, involves placing a thin-film superconductor between two ferromagnetic layers. A change of magnetization-alignment in such a superconducting spin-valve from parallel (P) to antiparallel (AP) creates a positive shift in the superconducting transition temperature (ΔTc) due to an interplay of the magnetic exchange energy and the superconducting condensate. The magnitude of ΔTc scales inversely with the superconductor thickness (dS) and is zero when dS exceeds the superconducting coherence length (ξ) as predicted by de Gennes. Here, we report a superconducting spin-valve effect involving a different underlying mechanism that goes beyond de Gennes in which magnetization-alignment and ΔTc are determined by the nodal quasiparticle-excitation states on the Fermi surface of the d-wave superconductor YBa2Cu3O7-δ (YBCO) grown between insulating layers of ferromagnetic Pr0.8Ca0.2MnO3. We observe ΔTc values that approach 2 K with ΔTc oscillating with dS over a length scale exceeding 100 ξ and, for particular values of dS, we find that the superconducting state reinforces an antiparallel magnetization-alignment. These results pave the way for all-oxide superconducting memory in which superconductivity modulates the magnetic state.

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Cited by in corpus (18)

• Materials challenges for SrRuO3: from conventional to quantum electronics
• Anomalous Josephson Coupling and High-Harmonics in Non-Centrosymmetric Superconductors with $S$-wave Spin-Triplet Pairing
• Long-range interaction of magnetic moments in a coupled system of S/F/S Josephson junctions with anomalous ground-state phase shift
• Realisation of de Gennes${}^{\prime }$ Absolute Superconducting Switch with a Heavy Metal Interface
• Controllable magnetic states in chains of coupled phi-0 Josephson junctions with ferromagnetic weak links
• Inverse Proximity Effects at Spin-Triplet Superconductor-Ferromagnet Interface
• Electric field enhancement of the superconducting spin-valve effect via strain-transfer across a ferromagnetic/ferroelectric interface
• Enhanced controllable triplet proximity effect in superconducting spin-orbit coupled spin valves with modified superconductor/ferromagnet interfaces
• RKKY interaction in a spin-split superconductor
• RKKY interaction in triplet superconductors: Dzyaloshinskii-Moriya-type interaction mediated by spin-polarized Cooper pairs
• Magnetic exchange interaction in spin-valve with chiral spin-triplet superconductor
• The effect of midgap states on the magnetic exchange interaction mediated by a $d$-wave superconductor
• Spin and charge transport in ferromagnet-superconductor-ferromagnet heterostructures: Stoner versus spin mass mismatch mechanism
• Large Tunable Thermoelectric Effects in Superconducting Spin Valves with Commercially Available Materials
• Dzyaloshinskii-Moriya-type spin-spin interaction from mixed-parity superconductivity
• Self-consistent solution for the magnetic exchange interaction mediated by a superconductor
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures
• Gate-Tunable Superconducting Spin Valve in a van der Waals Ferromagnet/Superconductor/Ferromagnet Trilayer