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arxiv: 2604.18385 · v2 · submitted 2026-04-20 · ❄️ cond-mat.supr-con · cond-mat.str-el

Superconductivity in Ruddlesden-Popper nickelates: a review of recent progress, focusing on thin films

Yang Zhang , Ling-Fang Lin , Thomas A. Maier , Elbio Dagotto This is my paper

Pith reviewed 2026-05-10 03:14 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords superconductivitynickelatesRuddlesden-Popper phasesthin filmsambient pressureLa3Ni2O7strain engineeringhigh-Tc superconductivity
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0 comments X

The pith

Compressive strain in ultra-thin films enables ambient-pressure superconductivity in La3Ni2O7 nickelates.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reviews recent experimental and theoretical advances on superconductivity in Ruddlesden-Popper nickelates, beginning with the high-pressure discovery of Tc around 80 K in bulk La3Ni2O7 and extending to trilayer La4Ni3O10. It emphasizes the new observation that ultra-thin La3Ni2O7 films superconduct at ambient pressure when deposited on substrates that impose compressive strain. This development removes the high-pressure constraint that previously limited experimental access, allowing a wider set of measurement techniques to probe the materials. Comparing the strained films with the pressurized bulk samples is presented as a route to clarify the pairing mechanism in these correlated systems.

Core claim

Ambient-pressure superconductivity emerges in La3Ni2O7 when grown as ultra-thin films under compressive strain from suitable substrates, paralleling the high-pressure superconductivity seen in bulk Ruddlesden-Popper nickelates.

What carries the argument

Compressive strain imposed by the substrate on the nickelate film, which modifies the lattice and electronic structure to stabilize superconductivity without external pressure.

If this is right

  • Experimental studies of nickelate superconductivity can now employ surface-sensitive probes and device fabrication methods that are incompatible with high-pressure cells.
  • Direct comparison of pressure-tuned bulk samples and strain-tuned films can isolate the role of specific lattice distortions in the superconducting mechanism.
  • The similarity between high-pressure and strain-induced superconductivity suggests that structural tuning, rather than pressure per se, is the essential control parameter.
  • Trilayer and higher-order Ruddlesden-Popper phases may also become accessible at ambient pressure through analogous thin-film strain engineering.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If strain and pressure produce equivalent electronic states, heterostructures that combine nickelate films with other functional layers could be used to test proximity effects or gate-tuned superconductivity.
  • Thickness-dependent studies of the films could reveal whether the superconductivity is truly two-dimensional or retains three-dimensional character, providing a testable distinction from the bulk pressurized case.
  • The approach may generalize to other layered correlated materials where high pressure has been required to reach a superconducting dome.

Load-bearing premise

The superconductivity measured in the films is produced by the nickelate layer itself and is not an artifact of the substrate interface or sample inhomogeneity.

What would settle it

A control experiment in which the same nickelate composition is grown without compressive strain or on a lattice-matched substrate and shows no superconductivity while all other growth and measurement conditions remain identical.

Figures

Figures reproduced from arXiv: 2604.18385 by Elbio Dagotto, Ling-Fang Lin, Thomas A. Maier, Yang Zhang.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Sketch of the oxygen reduction process used to convert NdNiO [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) Temperature–pressure phase diagram of [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Resistance vs. temperature for a sample of La [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) Tight-binding band structure and (b) Fermi surface of bilayer La [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (a) Magnetic susceptibility for the two-orbital Hubbard-Hund model, using the RPA technique. Reprinted from [ [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. (a) Illustration of the [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Schematic crystal structures and electronic densities of 3 [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Phase diagram of a small 2 [PITH_FULL_IMAGE:figures/full_fig_p010_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. (a) Resistivity [PITH_FULL_IMAGE:figures/full_fig_p012_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. (a) Superconductor-insulator transition in the La [PITH_FULL_IMAGE:figures/full_fig_p013_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Trend of [PITH_FULL_IMAGE:figures/full_fig_p015_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12. Critical temperature [PITH_FULL_IMAGE:figures/full_fig_p015_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13. Sketch of (a) 1 unit-cell film of (La,Pr) [PITH_FULL_IMAGE:figures/full_fig_p016_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: FIG. 14. ARPES results for (La,Pr,Sm) [PITH_FULL_IMAGE:figures/full_fig_p017_14.png] view at source ↗
Figure 16
Figure 16. Figure 16: FIG. 16. Superconducting pairing symmetry according to [PITH_FULL_IMAGE:figures/full_fig_p018_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: FIG. 17. (a) Changes in the angle of the Ni-O-Ni bond varying the in-plane lattice constants, while relaxing the out-of-plane [PITH_FULL_IMAGE:figures/full_fig_p019_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: FIG. 18. (a-d) Sketch explaining the difference between [PITH_FULL_IMAGE:figures/full_fig_p020_18.png] view at source ↗
Figure 20
Figure 20. Figure 20: FIG. 20. Phase diagram of the single-bilayer film on LSAO, [PITH_FULL_IMAGE:figures/full_fig_p022_20.png] view at source ↗
Figure 19
Figure 19. Figure 19: FIG. 19. (a) The calculated transition temperature of the [PITH_FULL_IMAGE:figures/full_fig_p022_19.png] view at source ↗
Figure 21
Figure 21. Figure 21: FIG. 21. (a) Pressure-dependent phase diagram showing the crystal structures transitions, the density-wave (denoted DW) [PITH_FULL_IMAGE:figures/full_fig_p023_21.png] view at source ↗
Figure 22
Figure 22. Figure 22: FIG. 22. Structural schematic of the (a) 1212 and (b) 1313 hybrid films on the LSAO substrate. ML and BL represent [PITH_FULL_IMAGE:figures/full_fig_p023_22.png] view at source ↗
read the original abstract

The discovery of superconductivity with Tc ~ 80 K in the nickelate Ruddlesden-Popper bilayer La3Ni2O7 at high pressure has opened a new platform for unconventional superconductivity, followed by the subsequent observation of superconductivity in trilayer La4Ni3O10, also at high pressure. Remarkably, ambient-pressure superconductivity was also observed recently in La3Ni2O7 ultra-thin films when grown on substrates that provide compressive strain. This discovery significantly extends the type of experimental techniques that can be used in nickelates, previously limited due to the high-pressure constraint. Discussing the similarities and differences among these nickel oxides will provide new insights into understanding the mechanism of high-Tc superconductivity in correlated electron systems. In this paper, we review the experimental and theoretical progress on RuddlesdenPopper nickelates, with emphasis on thin films, and discuss future perspectives and research directions.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The manuscript is a review of superconductivity in Ruddlesden-Popper nickelates, with emphasis on thin films. It outlines the discovery of high-pressure superconductivity (Tc ~80 K) in bilayer La3Ni2O7, subsequent observations in trilayer La4Ni3O10, and the recent report of ambient-pressure superconductivity in compressively strained ultra-thin La3Ni2O7 films. The review covers experimental and theoretical progress, similarities and differences among these systems, and future research directions to elucidate the high-Tc mechanism.

Significance. If the ambient-pressure thin-film superconductivity is intrinsic to the strained nickelate, the review is significant for highlighting how strain engineering in thin films can remove the high-pressure barrier, enabling wider use of experimental techniques and facilitating comparisons that may clarify the pairing mechanism in these correlated systems.

major comments (1)
  1. [Abstract] Abstract: The statement that ambient-pressure superconductivity was observed in La3Ni2O7 ultra-thin films grown on compressive-strain substrates is presented as a key advance extending the nickelate platform. However, the review does not address potential substrate-induced artifacts, interface reconstruction, oxygen non-stoichiometry, or strain relaxation, which are common in ultra-thin oxide films and directly bear on whether the superconductivity is intrinsic rather than artifactual.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our review and for the constructive comment on the abstract and thin-film discussion. We address the point below and describe the revisions we will implement.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The statement that ambient-pressure superconductivity was observed in La3Ni2O7 ultra-thin films grown on compressive-strain substrates is presented as a key advance extending the nickelate platform. However, the review does not address potential substrate-induced artifacts, interface reconstruction, oxygen non-stoichiometry, or strain relaxation, which are common in ultra-thin oxide films and directly bear on whether the superconductivity is intrinsic rather than artifactual.

    Authors: We agree that potential artifacts must be explicitly considered when evaluating claims of intrinsic superconductivity in ultra-thin oxide films. The abstract is intentionally concise and focuses on the reported advance, while the body of the review summarizes the experimental claims from the primary literature, including the use of compressive-strain substrates and basic structural characterization. However, we acknowledge that a more direct discussion of substrate-induced effects, interface reconstruction, oxygen non-stoichiometry, and strain relaxation is warranted to give readers a balanced perspective. In the revised manuscript we will add a dedicated paragraph within the thin-film section that reviews these common issues in oxide epitaxy, references the characterization data presented in the original reports, and notes the current experimental limitations in fully excluding artifacts. This addition will be placed immediately after the description of the ambient-pressure results and will include citations to relevant studies on strain relaxation and interface chemistry in related nickelate and cuprate systems. revision: yes

Circularity Check

0 steps flagged

No circularity: review paper reports external observations without internal derivations or self-referential predictions

full rationale

This is a review article summarizing experimental and theoretical progress on Ruddlesden-Popper nickelates from the literature, with emphasis on thin-film results. No original derivations, equations, fitted parameters, or predictions are presented in the provided text. The central claim about ambient-pressure superconductivity in compressively strained La3Ni2O7 ultra-thin films is attributed to recent external observations rather than derived within the paper. All content relies on cited external literature without self-citation chains that bear load on any claimed result, and no steps reduce by construction to the paper's own inputs. The derivation chain is absent, rendering the paper self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As a review paper, it introduces no free parameters, axioms, or invented entities; all content summarizes previously published work.

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Forward citations

Cited by 3 Pith papers

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

  1. Shear-stress-constrained superconductivity in Ruddlesden-Popper nickelates

    cond-mat.supr-con 2026-05 unverdicted novelty 5.0

    Superconductivity in Ruddlesden-Popper nickelates requires the Ni-O framework to deform within a bounded shear-strain window.

  2. Superconductivity in bilayer La$_3$Ni$_2$O$_7$: A review focusing on the strong-coupling Hund's rule assisted pairing mechanism

    cond-mat.supr-con 2026-04 unverdicted novelty 3.0

    Superconductivity in La3Ni2O7 arises from interlayer Cooper pairs of 3d_x2-y2 electrons driven by effective J_perp from Hund-assisted AFM exchange transfer, while localized 3d_z2 electrons form rung singlets that prod...

  3. Experimental Progress in Ambient-Pressure Superconducting Bilayer Nickelate Films

    cond-mat.supr-con 2026-05 unverdicted novelty 2.0

    Epitaxial strain enables ambient-pressure superconductivity in bilayer nickelate films, facilitating detailed studies of their properties and phase diagrams.

Reference graph

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