Superconductivity in freestanding infinite-layer nickelate membranes

Abstract

The observation of superconductivity in infinite-layer nickelates has attracted significant attention due to its potential as a new platform for exploring high ${\text{T}}_c$ superconductivity. However, thus far, superconductivity has only been observed in epitaxial thin films, which limits the manipulation capabilities and modulation methods compared to two-dimensional exfoliated materials. Given the exceptionally giant strain tunability and stacking capability of freestanding membranes, separating superconducting nickelates from the as-grown substrate is a novel way to engineer the superconductivity and uncover the underlying physics. Herein, we report the synthesis of the superconducting freestanding ${\mathrm{La}}_{0.8}{\mathrm{Sr}}_{0.2}\mathrm{Ni}{\mathrm{O}}_2$ membranes (${\text{T}}_c=10.9\mathrm{K}$), emphasizing the crucial roles of the interface engineering in the precursor phase film growth and the quick transfer process in achieving superconductivity. Our work offers a new versatile platform for investigating the superconductivity in nickelates, such as the pairing symmetry via constructing Josephson tunneling junctions and higher ${\text{T}}_c$ values via high-pressure experiments.

arXiv comment20 pages, 9 figures

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Cited by in corpus (5)

• Unraveling p-type and n-type interfaces in Superconducting Infinite-Layer Nickelate thin films
• Freestanding perovskite and infinite-layer nickelate membranes
• Orbital-selective spin-triplet superconductivity in infinite-layer LaNiO${}_2$
• Freestanding GdBa2Cu3O7 Thin Films via Optimized Buffer Layer Design: Preserving Superconducting Properties
• Surfaces and interfaces of infinite-layer nickelates studied by dynamical mean-field theory