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Structural and Electronic Evolution of Bilayer Nickelates Under Biaxial Strain

T0 review · 3 major / 4 minor · reviewed 2026-08-09 · deepseek-v4-flash

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Pith's one-line read Compressive strain moves nickelate dz2 bands away from the Fermi level; superconductivity may not need them.

desk verdict Solid DFT+U map of strain effects across lanthanide bilayer nickelates with a useful new tight-binding parameter set; the 'dz2 not needed' conclusion is a reasonable speculation but rests on an untested phase/stoichiometry assumption about the real films. read the letter →

arxiv 2502.01624 v1 pith:C54FB6C4 submitted 2025-02-03 cond-mat.supr-con

H C Regan B. Bhatta , Xiaoliang Zhang , Yong Zhong , Chunjing Jia This is my paper · ORCID
classification cond-mat.supr-con
keywords bilayernickelateLa3Ni2O7biaxialstrainDFT+Utight-bindingmodeldz2orbitalsuperconductivityrare-earthnickelates
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper tries to establish that biaxial compressive strain is not simply a stand-in for high pressure in bilayer nickelates: in the realistic orthorhombic Amam phase, 2.5% compressive strain pushes the Ni $d_{z^2}$ bands downward, away from the Fermi level, while the experimentally superconducting strained thin films still show $T_c$ above 40 K. If correct, this would mean that the $d_{z^2}$ hole pocket seen in the high-pressure phase is not a prerequisite for superconductivity, redirecting attention to strain-tuned crystal fields and oxygen orbitals instead. The claim matters because it offers a concrete, experimentally accessible knob—epitaxial strain—for testing which electronic features actually drive pairing in nickelate superconductors.

What carries the argument

The central object is a sixteen-orbital tight-binding model (eight distinct bands) of the orthorhombic Amam phase, built from Wannier downfolded Ni $d_{x^2-y^2}$ and $d_{z^2}$ orbitals. The load-bearing quantities are the on-site energies $\epsilon_x$ and $\epsilon_z$, the interlayer hopping $t^z_\perp$, and the in-plane hoppings, which together explain the strain-induced band shifts and allow comparison with the high-pressure Fmmm phase.

What would settle it

Angle-resolved photoemission on a 2.5% compressively strained La3Ni2O7 film: if the $d_{z^2}$ bands are found to cross the Fermi level, or if the films are shown to be oxygen-deficient with a different effective band filling, the central band-structure comparison would fail.

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Extended reading notes

Core claim

Using DFT+U calculations with U = 3.5 eV, the authors find that 2.5% in-plane compressive strain of La3Ni2O7 in the Amam phase increases the apical Ni–O–Ni bond angle from 168.5° to 171.1°, but not to 180°, and causes the Ni $d_{z^2}$ bands to flatten and shift downward while the $d_{x^2-y^2}$ bands shift upward. The tight-binding parameters extracted from Wannier downfolding show that the on-site energy difference between $d_{x^2-y^2}$ and $d_{z^2}$ increases by about 50%, from 0.74 eV to 1.20 eV. Since compressively strained La3Ni2O7 films are experimentally superconducting, the paper concludes that the presence of $d_{z^2}$ bands at the Fermi energy—a hallmark of the high-pressure Fmmm phase—may not be required for superconductivity in bilayer nickelates.

Load-bearing premise

The comparison assumes that the experimentally superconducting strained films are the same stoichiometric, coherently strained Amam phase as the calculations, with no significant oxygen deficiency or strain relaxation that would change the band filling.

Editorial extensions

If this is right

  • Strain and pressure tune bilayer nickelates differently: compressive strain removes the $d_{z^2}$ bands from the Fermi level, whereas high pressure moves the bonding $d_{z^2}$ band above it.
  • The on-site energy difference $\epsilon_x - \epsilon_z$ is the dominant strain-tuned parameter, growing from 0.74 eV to 1.20 eV at 2.5% compression.
  • The $d_{z^2}$ hole pocket that appears under pressure is not a universal feature of superconductivity in these materials.
  • The apical Ni–O–Ni bond angle need not reach 180° for superconductivity, so structural snapshots alone cannot identify the superconducting phase.
  • A two-orbital model that accounts for the strain-enhanced $\epsilon_x - \epsilon_z$ and increased $d_{z^2}$ occupation is a more promising low-energy description than a single-orbital model.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If $d_{z^2}$ bands at the Fermi level are truly unnecessary, then single-orbital bilayer models built around the $d_{z^2}$ hole pocket may miss the essential physics in strained films, and the pairing glue may instead involve the crystal-field splitting and apical oxygen orbitals.
  • The paper itself notes that oxygen vacancies might dominate superconductivity; a decisive test would be an ozone-annealed series of strained films with controlled oxygen stoichiometry, tracking $T_c$ against the calculated band structure.
  • Tuning strain to systematically increase $\epsilon_x - \epsilon_z$ while measuring $T_c$ would provide a direct experimental probe of whether this crystal-field parameter controls pairing.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The paper uses DFT+U and Wannier downfolding to study the structural and electronic response of the bilayer nickelates Re3Ni2O7 (Re = lanthanides) in the orthorhombic Amam phase under biaxial compressive and tensile strain. It reports that compressive strain increases the apical Ni-O-Ni angle toward 180 degrees, moves the Ni dz2 bands away from the Fermi level, and increases the on-site energy difference between Ni dx2-y2 and dz2 from 0.74 eV to 1.20 eV in La3Ni2O7. The authors compare these results with the high-pressure Fmmm phase and argue that the absence of dz2 bands at the Fermi energy under strain suggests that dz2 bands may not be a requisite for superconductivity in bilayer nickelates.

Significance. If the central inference is accepted, the paper provides a useful systematic reference for strain engineering of bilayer nickelates and a concrete set of tight-binding parameters for the strained Amam phase. The Wannier downfolded tight-binding model reproduces the DFT+U bands, and the comparison between strain and pressure is a valuable organizing framework. However, the superconductivity-related conclusion is an indirect inference that depends on identifying the experimentally superconducting thin films with the specific stoichiometric, coherently strained Amam phase modeled here; the paper itself concedes that oxygen deficiencies may dominate the physics. The manuscript's main value lies in the structural and electronic characterization, while the claim about the role of dz2 bands needs to be either substantially better supported or explicitly downgraded.

major comments (3)
  1. [Discussions, first paragraph; Abstract] The inference that Ni dz2 bands need not cross the Fermi energy for superconductivity rests on the premise that the superconducting strained La3Ni2O7 films of Refs. [26,27] are in the same coherently strained, stoichiometric Amam phase as the -2.5% calculation. This premise is not established, and the manuscript itself provides reasons to doubt it: the Discussion states that 'oxygen concentration may play a more critical role than structural transitions' [41], and the Supplementary Materials note that oxygen deficiencies exceeding 0.08 lead to insulating behavior and that apical inner oxygen vacancies suppress superconductivity [47-49]. If the superconducting films contain oxygen vacancies or partially relaxed strain, the calculated downward shift of the dz2 bands does not describe the actual superconducting samples. The conclusion should be rephrased as conditional or supplemented by explicit modeling of oxygen vacancies and strain relaxation in the strained Amam phase.
  2. [Results, Electronic Structure Properties; Methods; Table 1] The central electronic result, namely the strain-induced increase of the dz2-dx2-y2 on-site energy difference from 0.74 eV to 1.20 eV, is obtained with a single value U = 3.5 eV, with no sensitivity test. While this U was previously matched to ARPES for unstrained La3Ni2O7, its validity under 2.5% compressive strain is assumed, not demonstrated. In addition, the comparison in Table 1 mixes tight-binding parameters from a DFT calculation at 29.5 GPa [14] and a DFT+U calculation at 50 GPa [38] with the present DFT+U results, so the stated contrast in crystal-field splitting between strain and pressure may partly reflect methodological differences. The authors should test the dependence of the dz2 band position and the on-site energy difference on U for the strained case and ensure that the pressure-phase parameters are obtained with comparable methodology.
  3. [Supplementary Materials, Section 1; Methods] The structural relaxation criterion for all Re3Ni2O7 compounds other than La3Ni2O7 is EDIFFG = 2 x 10^-2 eV, which is three orders of magnitude looser than the 8 x 10^-5 eV used for La3Ni2O7. The systematic lanthanide-series trends in Fig. 1D-F, including the claim that compressive strain monotonically increases the apical angle for elements heavier than Nd, may not be converged at this tolerance. The authors should either repeat the relaxations with a tighter criterion or explicitly report the residual forces and justify that the trends are robust.
minor comments (4)
  1. [Methods, First-principles DFT calculations] The text reads 'V ASP' with an unnatural space; it should read 'VASP' throughout.
  2. [Table 1] The caption contains the typo 'T able 1' and uses 'GPA' instead of 'GPa'; please correct both.
  3. [Results, Strain-induced Structural Change] The sentence describing the anisotropic strain simulation with a = b is confusing; please clarify that the in-plane strains along a and b are chosen so that the average strain is -2.5% while enforcing a = b, and distinguish this from the isotropic in-plane strain case.
  4. [Supplementary Materials, Section 4] The reference to 'Fig. 2A' for the definitions of inner and outer oxygen atoms is ambiguous because the main-text Fig. 2 shows bond lengths and angles rather than an atomistic labeling; please add an explicit schematic or refer to the inset in Fig. 1.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: DFT+U and Wannier downfolding are self-contained, and the superconductivity comparison rests on external experimental reports.

full rationale

The paper's central quantities—the strained Amam crystal structure, band positions, and tight-binding parameters—are obtained from DFT+U structural relaxations and Wannier downfolding of the same DFT+U band structure. The Wannier model is verified to reproduce the DFT bands ('matches perfectly'), so the on-site energy and hopping parameters are a faithful reparametrization rather than a fitted-to-conclusion input. The comparison with the high-pressure Fmmm phase uses published Wannier parameters from other groups [14,38], and the superconductivity inference relies on externally reported strained-film superconductivity [26,27]. The paper explicitly notes that oxygen vacancies could dominate superconductivity [41,48,49], which weakens the inference but is a sample-validity limitation, not circular reasoning. Self-citations (e.g., refs. [4,18]) are contextual and not load-bearing. No step reduces to its own inputs by construction.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The central electronic-structure results rest on standard DFT+U with a Hubbard U taken from ARPES, plus Wannier downfolding. The superconductivity interpretation adds the untested assumption that the experimental strained films match the calculated idealized Amam phase. No new entities are introduced.

free parameters (1)
  • Hubbard U (Ni 3d, Dudarev) = 3.5 eV
    Chosen to match the ARPES band structure of unstrained La3Ni2O7 [32]; directly affects the dz2 vs dx2-y2 splitting and therefore the central claim that dz2 bands leave the Fermi level under strain.
assumptions (4)
  • domain assumption Density functional theory (PBE functional) with the Dudarev +U correction captures the low-energy electronic structure of bilayer nickelates.
    Used throughout the Methods; the U value is justified by ARPES but not independently verified under strain.
  • domain assumption Rare-earth f-electrons can be treated as core states for all lanthanides in Re3Ni2O7.
    Methods state f-electrons are in the core; this may be inaccurate for Pr and Nd where f states can sit near the Fermi level, and it affects the lanthanide-series trends.
  • ad hoc to paper The experimentally superconducting strained films are in the same coherently strained Amam phase modeled here, with negligible oxygen deficiency and strain relaxation.
    The conclusion that dz2 at the Fermi level is not required assumes the calculated electronic structure applies to the films in Refs. [26, 27]; the paper does not model oxygen vacancies or phase inhomogeneity.
  • domain assumption Wannier downfolding with disentanglement yields an accurate low-energy tight-binding model.
    Standard method; the paper shows the tight-binding bands match the DFT bands (Fig. 4), but the model is not validated against any experimental quantity beyond the parent ARPES fit.

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Cite this review

Pith. "Pith review of Structural and Electronic Evolution of Bilayer Nickelates Under Biaxial Strain." pith.science (2026). https://pith.science/paper/C54FB6C4

@misc{pith2026250201624,
  author       = {Pith},
  title        = {Pith review of: Structural and Electronic Evolution of Bilayer Nickelates Under Biaxial Strain},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/C54FB6C4}},
  note         = {Machine review of arXiv:2502.01624}
}
abstract

The discovery of high-Tc superconductivity around 80K in bilayer nickelate La3Ni2O7 under high pressure has expanded the family of high-Tc superconductors above the nitrogen boiling temperature. Recent studies have further shown that ambient pressure superconductivity with a Tc exceeding 40K can be achieved in compressively strained La3Ni2O7 thin films, offering a tunable platform for investigating the pairing mechanism in high-Tc nickelates. A comprehensive understanding of the structural and electronic properties of bilayer nickelate under epitaxial strain is essential to advance this active field. In this work, we employ first-principles calculations to systematically explore the entire rare-earth (Re) series of bilayer nickelates Re3Ni2O7 in the realistic orthorhombic Amam phase under various compressive and tensile strain conditions. We highlight the materials properties change when strain is applied, and compare these results with those observed under high pressure. Our findings show that 2.5\% compressive strain increases the apical Ni-O-Ni bond angle toward 180 degree, and causes the Ni $d_{z^2}$ bands to move away from the Fermi level. The tight-binding parameters for the 2.5\% compressively strained La3Ni2O7 are quite similar to those of the unstrained material, except that the on-site energy difference between the Ni $d_{z^2}$ and $d_{x^2-y^2}$ orbitals increases by about 50 percent. Notably, the absence of the $d_{z^2}$ bands at the Fermi energy under compressive strain contrasts sharply with the electronic structure in the high-pressure {\it Fmmm} phase, suggesting that the presence of $d_{z^2}$ bands at the Fermi energy may not be a requisite for superconductivity.

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Forward citations

Cited by 5 Pith papers

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

  1. Spin correlations in La$_3$Ni$_2$O$_7$ thin films

    cond-mat.supr-con 2025-02 conditional novelty 7.0 of 10

    RIXS on strained La3Ni2O7 films shows the interlayer exchange Jz is enhanced under compressive strain (superconducting films) and suppressed under tensile strain, supporting spin-fluctuation-mediated interlayer pairing.

  2. Triplon-mediated pairing and the superconducting gap structure in bilayer nickelates

    cond-mat.str-el 2026-02 conditional novelty 6.0 of 10

    Interlayer singlet-triplet excitations (triplons) mediate an interband s± superconducting pairing that explains the larger α-band gap and its anisotropy in bilayer nickelates.

  3. 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.

  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. Filling and Interlayer Superexchange Control Superconductivity in La$_3$Ni$_2$O$_7$

    cond-mat.supr-con 2026-03 unverdicted novelty 5.0 of 10

    The superconducting T_c of La3Ni2O7 is controlled by the d_x2-y2 orbital filling and the interlayer magnetic exchange J_perp, so clean electron doping should raise T_c.

Reference graph

Works this paper leans on

49 extracted references · 28 canonical work pages · cited by 5 Pith papers

  1. [41]

    https://arxiv.org/abs/2501.14202

    Shi, M., Peng, D., Li, Y., Xing, Z., Wang, Y., Fan, K., Li, H., Wu, R., Zeng, Z., Zeng, Q., Ying, J., Wu, T., Chen, X.: Prerequisite of superconductivity: SDW rather than tetragonal structure in double-layer La3Ni2O7−x (2025). https://arxiv.org/abs/2501.14202

    arXiv 2025

  2. [14]

    Luo, Z., Hu, X., Wang, M., W´ u, W., Yao, D.-X.: Bilayer two-orbital model of La3Ni2O7 under pressure. Phys. Rev. Lett. 131, 126001 (2023) https://doi.org/10.1103/PhysRevLett.131.126001

    doi:10.1103/physrevlett.131.126001 2023

  3. [38]

    Nature Communications 15(1), 2470 (2024) https://doi.org/10.1038/s41467-024-46622-z

    Zhang, Y., Lin, L.-F., Moreo, A., Maier, T.A., Dagotto, E.: Structural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La 3Ni2O7 under pressure. Nature Communications 15(1), 2470 (2024) https://doi.org/10.1038/s41467-024-46622-z

    doi:10.1038/s41467-024-46622-z 2024

  4. [1]

    Zeitschrift f¨ ur Physik B Condensed Matter64(2), 189–193 (1986)

    Bednorz, J.G., M¨ uller, K.A.: Possible high Tc superconductivity in the Ba-La-Cu-O system. Zeitschrift f¨ ur Physik B Condensed Matter64(2), 189–193 (1986)

    work page 1986

  5. [2]

    Dagotto, E.: Correlated electrons in high-temperature superconductors. Rev. Mod. Phys. 66, 763–840 (1994) https://doi.org/10.1103/RevModPhys.66.763

    doi:10.1103/revmodphys.66.763 1994

  6. [3]

    Nature 572(7771), 624–627 (2019)

    Li, D., Lee, K., Wang, B.Y., Osada, M., Crossley, S., Lee, H.R., Cui, Y., Hikita, Y., Hwang, H.Y.: Superconductivity in an infinite-layer nickelate. Nature 572(7771), 624–627 (2019)

    work page 2019

  7. [4]

    Been, E., Lee, W.-S., Hwang, H.Y., Cui, Y., Zaanen, J., Devereaux, T., Moritz, B., Jia, C.: Electronic structure trends across the rare-earth series in superconducting infinite-layer nickelates. Phys. Rev. X 11, 011050 (2021) https://doi.org/10.1103/PhysRevX.11.011050

    doi:10.1103/physrevx.11.011050 2021

  8. [5]

    Wu, X., Di Sante, D., Schwemmer, T., Hanke, W., Hwang, H.Y., Raghu, S., Thomale, R.: Robust dx2−y2 -wave superconductivity of infinite-layer nickelates. Phys. Rev. B 101, 060504 (2020) https: //doi.org/10.1103/PhysRevB.101.060504

    doi:10.1103/physrevb.101.060504 2020

Show all 49 references
  1. [6]

    Jiang, M., Berciu, M., Sawatzky, G.A.: Stabilization of singlet hole-doped state in infinite-layer nickelate superconductors. Phys. Rev. B 106, 115150 (2022) https://doi.org/10.1103/PhysRevB.106.115150

    2022 doi

  2. [7]

    Jiang, M., Berciu, M., Sawatzky, G.A.: Critical nature of the ni spin state in doped ndnio 2. Phys. Rev. Lett. 124, 207004 (2020) https://doi.org/10.1103/PhysRevLett.124.207004

    2020 doi

  3. [8]

    Zeng, S., Tang, C.S., Yin, X., Li, C., Li, M., Huang, Z., Hu, J., Liu, W., Omar, G.J., Jani, H., Lim, Z.S., Han, K., Wan, D., Yang, P., Pennycook, S.J., Wee, A.T.S., Ariando, A.: Phase diagram and superconducting dome of infinite-layer nd 1−xsrxnio2 thin films. Phys. Rev. Lett...

    2020 doi

  4. [9]

    Nature 621(7979), 493–498 (2023)

    Sun, H., Huo, M., Hu, X., Li, J., Liu, Z., Han, Y., Tang, L., Mao, Z., Yang, P., Wang, B.,et al.: Signatures of superconductivity near 80 k in a nickelate under high pressure. Nature 621(7979), 493–498 (2023)

    2023

  5. [10]

    Nature (2024) https://doi.org/10.1038/s41586-024-07996-8

    Wang, N., Wang, G., Shen, X., Hou, J., Luo, J., Ma, X., Yang, H., Shi, L., Dou, J., Feng, J., Yang, J., Shi, Y., Ren, Z., Ma, H., Yang, P., Liu, Z., Liu, Y., Zhang, H., Dong, X., Wang, Y., Jiang, K., Hu, J., Nagasaki, S., Kitagawa, K., Calder, S., Yan, J., Sun, J., Wang, B., Z...

    2024 doi

  6. [11]

    Journal of the American Chemical Society 146(11), 7506–7514 (2024) 14

    Wang, L., Li, Y., Xie, S.-Y., Liu, F., Sun, H., Huang, C., Gao, Y., Nakagawa, T., Fu, B., Dong, B., et al.: Structure Responsible for the Superconducting State in La 3Ni2O7 at High-Pressure and Low-Temperature Conditions. Journal of the American Chemical Society 146(11), 7506–...

    2024

  7. [12]

    npj Quantum Materials 9(1), 38 (2024) https://doi.org/10.1038/s41535-024-00648-0

    Geisler, B., Hamlin, J.J., Stewart, G.R., Hennig, R.G., Hirschfeld, P.J.: Structural transitions, octa- hedral rotations, and electronic properties of A 3Ni2O7 rare-earth nickelates under high pressure. npj Quantum Materials 9(1), 38 (2024) https://doi.org/10.1038/s41535-024-00648-0

    2024 doi

  8. [13]

    npj Quantum Materials 9(1), 61 (2024) https://doi.org/10.1038/ s41535-024-00668-w

    Luo, Z., Lv, B., Wang, M., W´ u, W., Yao, D.-X.: High-T c superconductivity in La 3Ni2O7 based on the bilayer two-orbital t-J model. npj Quantum Materials 9(1), 61 (2024) https://doi.org/10.1038/ s41535-024-00668-w

    2024

  9. [15]

    Sakakibara, H., Kitamine, N., Ochi, M., Kuroki, K.: Possible high Tc superconductivity in La 3Ni2O7 under high pressure through manifestation of a nearly half-filled bilayer hubbard model. Phys. Rev. Lett. 132, 106002 (2024) https://doi.org/10.1103/PhysRevLett.132.106002

    2024 doi

  10. [16]

    Lu, C., Pan, Z., Yang, F., Wu, C.: Interlayer-coupling-driven high-temperature superconductivity in La3Ni2O7 under pressure. Phys. Rev. Lett. 132, 146002 (2024) https://doi.org/10.1103/PhysRevLett. 132.146002

    2024 doi

  11. [17]

    Kaneko, T., Sakakibara, H., Ochi, M., Kuroki, K.: Pair correlations in the two-orbital hubbard ladder: Implications for superconductivity in the bilayer nickelate La3Ni2O7. Phys. Rev. B 109, 045154 (2024) https://doi.org/10.1103/PhysRevB.109.045154

    2024 doi

  12. [18]

    Nature Communications 12, 461 (2021) https://doi.org/10.1038/s41467-020-20745-5

    Ke, F., Wang, C., Jia, C., Wolf, N.R., Yan, J., Niu, S., Devereaux, T.P., Karunadasa, H.I., Mao, W.L., Lin, Y.: Preserving a robust CsPbI 3 perovskite phase via pressure-directed octahedral tilt. Nature Communications 12, 461 (2021) https://doi.org/10.1038/s41467-020-20745-5

    2021 doi

  13. [19]

    Science 365(6454), 679–684 (2019) https://doi.org/10.1126/science.aax3878 https://www.science.org/doi/pdf/10.1126/science.aax3878

    Steele, J.A., Jin, H., Dovgaliuk, I., Berger, R.F., Braeckevelt, T., Yuan, H., Martin, C., Solano, E., Lejaeghere, K., Rogge, S.M.J., Notebaert, C., Vandezande, W., Janssen, K.P.F., Goderis, B., Debroye, E., Wang, Y.-K., Dong, Y., Ma, D., Saidaminov, M., Tan, H., Lu, Z., Dyadk...

    2019 doi

  14. [20]

    Applied Surface Science 188(1), 170–175 (2002) https://doi.org/10.1016/ S0169-4332(01)00730-9

    Ranno, L., Llobet, A., Tiron, R., Favre-Nicolin, E.: Strain-induced magnetic anisotropy in epi- taxial manganite films. Applied Surface Science 188(1), 170–175 (2002) https://doi.org/10.1016/ S0169-4332(01)00730-9 . E-MRS SYMPOSIUM M; STRESS AND STRAIN IN HETEROEPITAXY

    2002

  15. [21]

    Materials Science and Engineering: B 56(2), 158–163 (1998) https://doi.org/10.1016/ S0921-5107(98)00226-8

    Konishi, Y., Kasai, M., Izumi, M., Kawasaki, M., Tokura, Y.: Epitaxial growth and strain of mangan- ite thin films. Materials Science and Engineering: B 56(2), 158–163 (1998) https://doi.org/10.1016/ S0921-5107(98)00226-8

    1998

  16. [22]

    Bruno, F.Y., Rushchanskii, K.Z., Valencia, S., Dumont, Y.: Rationalizing strain engineering effects in rare-earth nickelates. Phys. Rev. B 88, 195108 (2013) https://doi.org/10.1103/PhysRevB.88.195108

    2013 doi

  17. [23]

    Nature Communications 11(1), 2949 (2020) https://doi.org/10

    Guo, Q., Farokhipoor, S., Mag´ en, C., Rivadulla, F., Noheda, B.: Tunable resistivity exponents in the metallic phase of epitaxial nickelates. Nature Communications 11(1), 2949 (2020) https://doi.org/10. 1038/s41467-020-16740-5

    2020

  18. [24]

    Applied Physics Let- ters 76(15), 2041–2043 (2000) https://doi.org/10.1063/1.126248 https://pubs.aip.org/aip/apl/article- pdf/76/15/2041/18548563/2041 1 online.pdf

    Novojilov, M.A., Gorbenko, O.Y., Graboy, I.E., Kaul, A.R., Zandbergen, H.W., Babushkina, N.A., Belova, L.M.: Perovskite rare-earth nickelates in the thin-film epitaxial state. Applied Physics Let- ters 76(15), 2041–2043 (2000) https://doi.org/10.1063/1.126248 https://pubs.aip....

    2000 doi

  19. [25]

    Annual Review of Materials Research 46(Volume 46, 2016), 305–334 (2016) https://doi.org/10.1146/annurev-matsci-070115-032057

    Middey, S., Chakhalian, J., Mahadevan, P., Freeland, J.W., Millis, A.J., Sarma, D.D.: Physics of ultrathin films and heterostructures of rare-earth nickelates. Annual Review of Materials Research 46(Volume 46, 2016), 305–334 (2016) https://doi.org/10.1146/annurev-matsci-070115-032057

    2016 doi

  20. [26]

    Nature (2024) https://doi.org/10.1038/s41586-024-08525-3 15

    Ko, E.K., Yu, Y., Liu, Y., Bhatt, L., Li, J., Thampy, V., Kuo, C.-T., Wang, B.Y., Lee, Y., Lee, K., Lee, J.-S., Goodge, B.H., Muller, D.A., Hwang, H.Y.: Signatures of ambient pressure superconductivity in thin film La 3Ni2O7. Nature (2024) https://doi.org/10.1038/s41586-024-08525-3 15

    2024 doi

  21. [27]

    https://arxiv.org/abs/2501.08022

    Liu, Y., Ko, E.K., Tarn, Y., Bhatt, L., Goodge, B.H., Muller, D.A., Raghu, S., Yu, Y., Hwang, H.Y.: Superconductivity and normal-state transport in compressively strained La 2PrNi2O7 thin films (2025). https://arxiv.org/abs/2501.08022

    2025 arXiv

  22. [28]

    https://arxiv.org/abs/2412.16622

    Zhou, G., Lv, W., Wang, H., Nie, Z., Chen, Y., Li, Y., Huang, H., Chen, W., Sun, Y., Xue, Q.-K., Chen, Z.: Ambient-pressure superconductivity onset above 40 K in bilayer nickelate ultrathin films (2024). https://arxiv.org/abs/2412.16622

    2024 arXiv

  23. [29]

    Physical Review Materials 8(4), 044801 (2024)

    Rhodes, L.C., Wahl, P.: Structural routes to stabilize superconducting La 3Ni2O7 at ambient pressure. Physical Review Materials 8(4), 044801 (2024)

    2024

  24. [30]

    arXiv, 2412–04391 (2024) https://arxiv.org/abs/2412.04391

    Zhao, Y.-F., Botana, A.S.: Electronic structure of Ruddlesden-Popper nickelates: strain to mimic the effects pressure. arXiv, 2412–04391 (2024) https://arxiv.org/abs/2412.04391

    2024 arXiv

  25. [31]

    Journal of the American Chemical Society 146(11), 7506–7514 (2024) https://doi.org/10.1021/jacs

    Wang, L., Li, Y., Xie, S.-Y., Liu, F., Sun, H., Huang, C., Gao, Y., Nakagawa, T., Fu, B., Dong, B., Cao, Z., Yu, R., Kawaguchi, S.I., Kadobayashi, H., Wang, M., Jin, C., Mao, H.-k., Liu, H.: Structure responsible for the superconducting state in La3Ni2O7 at high-pressure and l...

    2024 doi

  26. [32]

    Nature Communications 15(1), 4373 (2024)

    Yang, J., Sun, H., Hu, X., Xie, Y., Miao, T., Luo, H., Chen, H., Liang, B., Zhu, W., Qu, G., et al.: Orbital-dependent electron correlation in double-layer nickelate La 3Ni2O7. Nature Communications 15(1), 4373 (2024)

    2024

  27. [33]

    Zhang, Y., Lin, L.-F., Moreo, A., Maier, T.A., Dagotto, E.: Trends in electronic structures and s±- wave pairing for the rare-earth series in bilayer nickelate superconductor R3Ni2O7. Phys. Rev. B 108, 165141 (2023) https://doi.org/10.1103/PhysRevB.108.165141

    2023 doi

  28. [34]

    arXiv preprint arXiv:2401.04258 (2024)

    Geisler, B., Fanfarillo, L., Hamlin, J.J., Stewart, G.R., Hennig, R.G., Hirschfeld, P.: Optical prop- erties and electronic correlations in la 3ni2o7−δ bilayer nickelates under high pressure. arXiv preprint arXiv:2401.04258 (2024)

    2024 arXiv

  29. [35]

    Journal of Physics: Condensed Matter 32(16), 165902 (2020) https://doi.org/10.1088/1361-648x/ab51ff

    Pizzi, G., Vitale, V., Arita, R., Bl¨ ugel, S., Freimuth, F., G´ eranton, G., Gibertini, M., Gresch, D., Johnson, C., Koretsune, T., Iba˜ nez-Azpiroz, J., Lee, H., Lihm, J.-M., Marchand, D., Marrazzo, A., Mokrousov, Y., Mustafa, J.I., Nohara, Y., Nomura, Y., Paulatto, L., Ponc...

    2020

  30. [36]

    Journal of Physics: Condensed Matter 29(46), 465901 (2017)

    Giannozzi, P., Andreussi, O., Brumme, T., Bunau, O., Nardelli, M.B., Calandra, M., Car, R., Cavazzoni, C., Ceresoli, D., Cococcioni, M., Colonna, N., Carnimeo, I., Corso, A.D., Gironcoli, S., Delugas, P., Jr, R.A.D., Ferretti, A., Floris, A., Fratesi, G., Fugallo, G., Gebauer,...

    2017

  31. [37]

    Souza, I., Marzari, N., Vanderbilt, D.: Maximally localized wannier functions for entangled energy bands. Phys. Rev. B 65, 035109 (2001) https://doi.org/10.1103/PhysRevB.65.035109

    2001 doi

  32. [39]

    Liu, Y.-B., Mei, J.-W., Ye, F., Chen, W.-Q., Yang, F.: s±-wave pairing and the destructive role of apical-oxygen deficiencies in La 3Ni2O7 under pressure. Phys. Rev. Lett. 131, 236002 (2023) https: //doi.org/10.1103/PhysRevLett.131.236002

    2023 doi

  33. [40]

    Lu, C., Pan, Z., Yang, F., Wu, C.: Interplay of two Eg orbitals in superconducting la 3ni2o7 under pressure. Phys. Rev. B 110, 094509 (2024) https://doi.org/10.1103/PhysRevB.110.094509 16

    2024 doi

  34. [42]

    Kresse, G., Hafner, J.: Ab initio molecular dynamics for liquid metals. Phys. Rev. B 47, 558–561 (1993) https://doi.org/10.1103/PhysRevB.47.558

    1993 doi

  35. [43]

    Physical review letters 77(18), 3865 (1996)

    Perdew, J.P., Burke, K., Ernzerhof, M.: Generalized Gradient Approximation Made Simple. Physical review letters 77(18), 3865 (1996)

    1996

  36. [44]

    Physical Review B 57(3), 1505 (1998)

    Dudarev, S.L., Botton, G.A., Savrasov, S.Y., Humphreys, C., Sutton, A.P.: Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study. Physical Review B 57(3), 1505 (1998)

    1998

  37. [45]

    Monkhorst, H.J., Pack, J.D.: Special points for Brillouin-zone integrations. Phys. Rev. B 13, 5188–5192 (1976) https://doi.org/10.1103/PhysRevB.13.5188

    1976 doi

  38. [46]

    Journal of Solid State Chemistry 152, 517–525 (2000)

    Ling, C.D., Argyriou, D.N., Wu, G.-Q., Neumeier, J.J.: Neutron Diffraction Study of La 3Ni2O7: Struc- tural Relationships Among n = 1, 2, and 3 Phases La n+1NinO3n+1. Journal of Solid State Chemistry 152, 517–525 (2000)

    2000

  39. [47]

    Journal of the Physical Society of Japan 64(5), 1644– 1650 (1995) https://doi.org/10.1143/JPSJ.64.1644

    Taniguchi, S., Nishikawa, T., Yasui, Y., Kobayashi, Y., Takeda, J., Shamoto, S.-i., Sato, M.: Transport, magnetic and thermal properties of La 3Ni2O7−δ. Journal of the Physical Society of Japan 64(5), 1644– 1650 (1995) https://doi.org/10.1143/JPSJ.64.1644

    1995 doi

  40. [48]

    Nature Physics, 1–5 (2024)

    Zhang, Y., Su, D., Huang, Y., Shan, Z., Sun, H., Huo, M., Ye, K., Zhang, J., Yang, Z., Xu, Y., et al.: High-temperature superconductivity with zero resistance and strange-metal behaviour in La 3Ni2O7−δ. Nature Physics, 1–5 (2024)

    2024

  41. [49]

    Bhatt, L., Jiang, A.Y., Ko, E.K., Schnitzer, N., Pan, G.A., Segedin, D.F., Liu, Y., Yu, Y., Zhao, Y.-F., Morales, E.A., Brooks, C.M., Botana, A.S., Hwang, H.Y., Mundy, J.A., Muller, D.A., Goodge, B.H.: Resolving Structural Origins for Superconductivity in Strain-Engineered La ...

    2025 arXiv

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Reviewed August 9, 2026 · model on record in the stance chip above.