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Structural and Electronic Evolution of Bilayer Nickelates Under Biaxial Strain
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DOI：10.1038/s42005-026-02757-7.png)
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Abstract
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The discovery of superconductivity above 40 K in strained bilayer nickelates provides a tunable platform for exploring unconventional superconductivity under ambient pressure. However, the microscopic mechanisms driving this strain-induced state and how they contrast with high-pressure effects remain poorly understood. Here we show, using first-principles calculations across the rare-earth series RE3Ni2O7, that in-plane compressive strain systematically alters atomic structures and electronic hybridization. Wannier downfolding reveals that 2.5% compression enhances interlayer and in-plane orbital hoppings while significantly enlarging the crystal field splitting, which shifts the Ni $${d}_{{z}^{2}}$$ bands entirely below the Fermi level. These findings elucidate the fundamental differences between strain-tuned and high-pressure electronic phases, offering critical guidance for optimizing superconducting properties in lanthanide-based thin films. Understanding how high-temperature superconductivity emerges beyond high pressure is a central goal for newly discovered nickelate families. Using first-principles calculations, the authors show that applying in-plane compressive strain to bilayer nickelates alters their atomic and electronic structures, uncovering the fundamental physics of strain-induced superconductivity.
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