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arxiv: 2605.14806 · v1 · pith:V3DSFNC2new · submitted 2026-05-14 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci

Atomically resolved intrinsic superconducting gap in (La,Pr)3Ni2O7 films

Xinxin Wang , Yaqi Chen , Cui Ding , Lizhi Xu , Jian-Jian Miao , Guangdi Zhou , Zhuoyu Chen , Yu-Jie Sun
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Jin-Feng Jia Qi-Kun Xue
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classification ❄️ cond-mat.supr-con cond-mat.mtrl-sci
keywords superconductingfilmsspectrabilayerintrinsicni2o7sqrtsurface
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Ruddlesden-Popper bilayer nickelates provide an emerging platform for studying high-temperature superconductivity, yet the superconducting pairing symmetry remains under debate. Here, we use atomic-resolution scanning tunnelling microscopy and spectroscopy to investigate superconducting 1.5-unit-cell (La,Pr)3Ni2O7 films grown on SrLaAlO4. A cryogenic ultrahigh-vacuum (UHV) sample transfer preserves an ordered sqrt(2) * sqrt(2) surface and yields reproducible U-shaped spectra with two gap scales of ~14 and ~20 meV and extended flat zero-conductance bottoms. By contrast, samples exposed for a longer time in UHV without cooling during transfer show V-shaped spectra despite retaining the surface reconstruction and a transport superconducting transition onset above 40 K. Wide-energy-range spectra indicate that oxygen loss can mix density-wave-related spectral weight. Our measurements provide an atomic-scale observation of the intrinsic nodeless superconducting gap in bilayer nickelate ultrathin films.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. What Does the Single-Particle Spectrum Imply on the Pairing Nature and Pairing Mechanism in La$_3$Ni$_2$O$_7$?

    cond-mat.str-el 2026-06 unverdicted novelty 7.0

    Symmetry analysis shows orbital hybridization vanishes along the BZ diagonal, allowing the gap on alpha/beta pockets to test d_x2-y2 vs d_z2 dominance; experiments and RPA favor Hund's rule mechanism with full gap.

  2. Structural symmetry effects on the competition of density waves and superconductivity in bilayer nickelates

    cond-mat.supr-con 2026-06 unverdicted novelty 7.0

    fRG calculations on bilayer nickelate models show that approaching the tetragonal limit makes SDW fluctuations degenerate, frustrating magnetic order and enhancing superconductivity, identifying lattice symmetry as th...