Tuning the pairing interaction in a $d$-wave superconductor by paramagnons injected through interfaces

Abstract

Unconventional superconductivity and magnetism are intertwined on a microscopic level in a wide class of materials. A new approach to this most fundamental and hotly debated issue focuses on the role of interactions between superconducting electrons and bosonic fluctuations at the interface between adjacent layers in heterostructures. Here we fabricate hybrid superlattices consisting of alternating atomic layers of heavy-fermion superconductor CeCoIn${}_5$ and antiferromagnetic (AFM) metal CeRhIn${}_5$, in which the AFM order can be suppressed by applying pressure. We find that the superconducting and AFM states coexist in spatially separated layers, but their mutual coupling via the interface significantly modifies the superconducting properties. An analysis of upper critical fields reveals that near the critical pressure where AFM order vanishes, the force binding superconducting electron-pairs acquires an extremely strong-coupling nature. This demonstrates that superconducting pairing can be tuned non-trivially by magnetic fluctuations (paramagnons) injected through the interface, leading to maximization of the pairing interaction.

8 pages, 9 figures

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Cited by in corpus (7)

• Strongly parity-mixed superconductivity in Rashba-Hubbard model
• Controlling unconventional superconductivity in artificially engineered $f$-electron Kondo superlattices
• Proximity-driven ferromagnetism and superconductivity in the triangular Rashba-Hubbard model
• Evidence for a finite-momentum Cooper pair in tricolor $d$-wave superconducting superlattices
• Coupling between heavy fermion superconductor CeCoIn${}_5$ and antiferromagnetic metal CeIn${}_3$ through the atomic interface
• Modification of magnetic fluctuations by interfacial interactions in artificially engineered heavy-fermion superlattices
• Dimensionality tuning of heavy-fermion states in ultrathin CeSi2 films