Percolative pathway to stripe order in KTaO3-based superconductivity

Abstract

The sensitivity of low-dimensional superconductors to fluctuations gives rise to emergent behaviors beyond the conventional Bardeen-Cooper-Schrieffer framework. Anisotropy is one such manifestation often linked to spatially modulated electronic responses and unconventional pairing mechanisms. Pronounced in-plane anisotropy recently reported at KTaO3-based oxide interfaces has been interpreted as indicative of a stripelike superconducting texture, yet its microscopic origin and formation pathway remain unresolved. Here, we show that disorder in MgO/KTaO3(111) heterostructures broadens the superconducting transition and reveals transport signatures suggesting a percolative evolution from localized superconducting coherence to a stripelike texture. The stripe width extracted from vortex-dynamical responses is comparable to the spin precession length, suggesting a self-organized modulation influenced by spin-orbit coupling and reduced lattice symmetry. These results highlight disorder as a tuning parameter for superconductivity in two-dimensional quantum materials.

Source-reported materials — not catalogue approval

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