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Resolving Structural Origins for Superconductivity in Strain-Engineered La$_3$Ni$_2$O$_7$ Thin Films

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arxiv 2501.08204 v1 pith:S3RJDHJT submitted 2025-01-14 cond-mat.supr-con

Lopa Bhatt , Abigail Y. Jiang , Eun Kyo Ko , Noah Schnitzer , Grace A. Pan , Dan Ferenc Segedin , Yidi Liu , Yijun Yu
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Yi-Feng Zhao Edgar Abarca Morales Charles M. Brooks Antia S. Botana Harold Y. Hwang Julia A. Mundy David A. Muller Berit H. Goodge
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classification cond-mat.supr-con
keywords filmsstructuralsuperconductivitythinbiaxialcompressionunderatomic
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abstract

The discovery of high-temperature superconductivity in bulk La$_3$Ni$_2$O$_7$ under high hydrostatic pressure and, more recently, biaxial compression in epitaxial thin films has ignited significant interest in understanding the interplay between atomic and electronic structure in these compounds. Subtle changes in the nickel-oxygen bonding environment are thought to be key drivers for stabilizing superconductivity, but specific details of which bonds and which modifications are most relevant remains so far unresolved. While direct, atomic-scale structural characterization under hydrostatic pressure is beyond current experimental capabilities, static stabilization of strained La$_3$Ni$_2$O$_7$ films provides a platform well-suited to investigation with new picometer-resolution electron microscopy methods. Here, we use multislice electron ptychography to directly measure the atomic-scale structural evolution of La$_3$Ni$_2$O$_7$ thin films across a wide range of biaxial strains tuned via substrate. By resolving both the cation and oxygen sublattices, we study strain-dependent evolution of atomic bonds, providing the opportunity to isolate and disentangle the effects of specific structural motifs for stabilizing superconductivity. We identify the lifting of crystalline symmetry through modification of the nickel-oxygen octahedral distortions under compressive strain as a key structural ingredient for superconductivity. Rather than previously supposed $c$-axis compression, our results highlight the importance of in-plane biaxial compression in superconducting thin films, which suggests an alternative -- possibly cuprate-like -- understanding of the electronic structure. Identifying local regions of inhomogeneous oxygen stoichiometry and high internal strain near crystalline defects, we suggest potential pathways for improving the sharpness and temperature of the superconducting transition.

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Cited by 7 Pith papers

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

  1. Superexchanges and Charge Transfer in the La$_3$Ni$_2$O$_7$ Thin Films

    cond-mat.supr-con 2025-11 conditional novelty 6.0 of 10

    In La3Ni2O7 thin films, the interlayer d3z2-r2 antiferromagnetic coupling is about 27% weaker than in bulk, in-plane coupling is nearly unchanged, and hole/electron doping is particle-hole asymmetric.

  2. Role of correlations in Ruddlesden-Popper bilayer nickelates under compressive strain

    cond-mat.str-el 2025-08 conditional novelty 6.0 of 10

    At -2% compressive strain, dynamic electron correlations make a dz2-derived flat band cross the Fermi level in bilayer La3Ni2O7, creating an extra Fermi pocket absent in static DFT+U; at -3% the pocket disappears.

  3. Pairing symmetry and superconductivity in La$_3$Ni$_2$O$_7$ thin films

    cond-mat.supr-con 2025-06 conditional novelty 6.0 of 10

    RMFT on the bilayer two-orbital t-J model predicts s±-wave pairing in La3Ni2O7 thin films, with a nodeless beta pocket and Tc near 60 K, plus an inter-orbital d-wave channel that reinforces the dominant pairing.

  4. Theoretical study on ambient pressure superconductivity in La$_3$Ni$_2$O$_7$ thin films : structural analysis, model construction, and robustness of $s\pm$-wave pairing

    cond-mat.supr-con 2025-06 unverdicted novelty 6.0 of 10

    s±-wave pairing remains robust in La3Ni2O7 thin-film models under FLEX, but reduced Tc is reproduced only when using the experimental structure's small interlayer hopping.

  5. Orbital-selective correlation effects and superconducting pairing symmetry in a multiorbital $t$-$J$ model for bilayer nickelates

    cond-mat.supr-con 2025-02 conditional novelty 5.0 of 10

    In a bilayer two-orbital t-J model for La3Ni2O7, the leading pairing is either extended s-wave or d_{x^2-y^2}-wave, and moving the z2 bonding band through the Fermi level switches the dominant pairing orbital from z2 ...

  6. The effect of Carrier Doping and Thickness on the Electronic Structures of La$3$Ni$2$O$7$ Thin Films

    cond-mat.supr-con 2025-02 conditional novelty 4.0 of 10

    A DFT+U study finds that a two-unit-cell La3Ni2O7 film doped with roughly 0.3 holes per formula unit reproduces the ARPES-observed gamma Fermi pockets, linking hole doping and film thickness to ambient-pressure superc...

  7. Recent progress in nickelate superconductors

    cond-mat.supr-con 2025-09 conditional novelty 2.0 of 10

    A comprehensive review of nickelate superconductors that surveys the 112, 327, and 43(10) families and frames the key open questions about their pairing mechanisms.

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