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arxiv: 2605.18954 · v1 · pith:A464HKVWnew · submitted 2026-05-18 · ❄️ cond-mat.str-el · cond-mat.supr-con

Imaging stripe dynamics in trilayer nickelate La₄Ni₃O₁₀

Uladzislau Mikhailau , Luke Rhodes , Siri A. Berge , Matthias Hepting , Masahiko Isobe , Carolina A. Marques , Pascal Puphal , Peter Wahl This is my paper

Pith reviewed 2026-05-20 08:14 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.supr-con
keywords stripe ordertrilayer nickelateLa4Ni3O10scanning tunneling microscopyphase slipsenergy gapcuprate comparisonelectron correlations
4
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The pith

Spin-polarised STM images four-unit-cell stripe order with 66 meV gap and electron-triggered phase slips in La4Ni3O10.

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

The paper shows that stripe order with four-unit-cell periodicity forms in the trilayer nickelate La4Ni3O10. This order closely matches the pattern in cuprate superconductors and opens a near-complete gap of about 66 meV at the Fermi level. Tunneling electrons above a 20 meV threshold trigger discrete phase slips in the stripes. The technique therefore permits direct atomic-scale imaging of stripe motion. The results indicate that electron correlations produce these orders in lanthanum nickelates and create clear parallels with cuprates.

Core claim

Spin-polarised scanning tunnelling microscopy visualizes the local magnetic and charge distribution of stripe order in La4Ni3O10. The order shows four-unit-cell periodicity, opens a ~66 meV gap at the Fermi level, and allows discrete phase slips to be triggered by tunneling electrons above a ~20 meV threshold, which in turn enables atomic-scale imaging of the dynamics.

What carries the argument

Spin-polarised scanning tunnelling microscopy that maps the local magnetic and charge modulations produced by the stripe order.

If this is right

  • Stripe order in this nickelate adopts the same four-unit-cell periodicity observed in cuprates.
  • The order opens a near-complete gap of ~66 meV at the Fermi level.
  • Tunneling electrons above ~20 meV can induce discrete phase slips and thereby reveal stripe motion.
  • Electron correlations are the driving force behind the stripe-like order in lanthanum nickelates.

Where Pith is reading between the lines

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

  • Shared stripe periodicity suggests common correlation mechanisms may operate across nickelates and cuprates.
  • The low 20 meV threshold for phase slips implies stripe patterns remain mobile and could fluctuate near any superconducting dome.
  • The same imaging approach could track how stripe order changes with doping in related nickelate compounds.

Load-bearing premise

The periodic modulations and gap recorded in the STM data arise from intrinsic bulk stripe order driven by electron correlations rather than surface reconstruction or tip effects.

What would settle it

A bulk probe such as ARPES or neutron scattering that detects neither the four-unit-cell modulation nor the 66 meV gap on the same crystals would show the features are not intrinsic.

Figures

Figures reproduced from arXiv: 2605.18954 by Carolina A. Marques, Luke Rhodes, Masahiko Isobe, Matthias Hepting, Pascal Puphal, Peter Wahl, Siri A. Berge, Uladzislau Mikhailau.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
read the original abstract

Since the discovery of high-temperature superconductivity in nickelate superconductors, it is an open question how closely the superconducting state resembles that of cuprate superconductors. One salient feature of the phase diagram of the high-temperature cuprate superconductors is stripe order. Despite their prevalence, real-space imaging has been limited to the charge sector. Here we use spin-polarised scanning tunnelling microscopy to visualize the local magnetic and charge distribution emerging due to a stripe order in the trilayer nickelate La$_4$Ni$_3$O$_{10}$. The stripe order exhibits a four unit cell periodicity, closely resembling that seen in cuprates, and opens a near-complete $\sim66\mathrm{meV}$ gap at the Fermi level. Crucially, discrete phase slips can be triggered by tunneling electrons above a $\sim 20\mathrm{meV}$ threshold, allowing imaging of stripe dynamics at the atomic scale. These results highlight the importance of correlation physics driving stripe-like orders in lanthanum nickelates with striking similarities to the cuprates.

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 / 2 minor

Summary. The manuscript reports spin-polarized scanning tunneling microscopy (STM) measurements on trilayer nickelate La₄Ni₃O₁₀. It claims to directly image stripe order exhibiting a four-unit-cell periodicity that closely resembles cuprate stripes, with this order opening a near-complete ∼66 meV gap at the Fermi level. The work further reports that discrete phase slips can be triggered by tunneling electrons above a ∼20 meV threshold, enabling atomic-scale visualization of stripe dynamics. These observations are interpreted as evidence that correlation physics drives cuprate-like stripe order in lanthanum nickelates.

Significance. If the STM features are confirmed to reflect intrinsic bulk stripe order, the results would establish a direct real-space link between nickelate and cuprate electronic structures, reinforcing the role of electron correlations in both families. The demonstration of electron-triggered phase slips at atomic resolution adds a dynamic element that is rarely accessible in prior stripe studies and could inform models of competing orders near superconductivity.

major comments (1)
  1. [Abstract] Abstract: The central claim that the observed four-unit-cell periodicity, ∼66 meV gap, and phase slips image intrinsic bulk stripe order requires explicit ruling out of surface-specific effects. Layered nickelates are known to exhibit surface reconstructions, oxygen-vacancy ordering, or termination-dependent states that can produce similar real-space modulations and apparent gaps; the manuscript provides no bulk-sensitive cross-check (e.g., neutron or resonant X-ray scattering) or quantitative comparison to surface-only models, leaving the bulk interpretation load-bearing but unverified.
minor comments (2)
  1. The abstract and main text should include a brief statement on STM tip polarization calibration and bias-dependent imaging conditions to allow readers to assess possible tip-induced dynamics versus intrinsic behavior.
  2. Figure captions and methods should report the number of independent samples, spatial regions, and statistical uncertainty on the extracted periodicity and gap values.

Simulated Author's Rebuttal

1 responses · 1 unresolved

We thank the referee for the constructive feedback on our manuscript. We address the major comment below and indicate where revisions will be made.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim that the observed four-unit-cell periodicity, ∼66 meV gap, and phase slips image intrinsic bulk stripe order requires explicit ruling out of surface-specific effects. Layered nickelates are known to exhibit surface reconstructions, oxygen-vacancy ordering, or termination-dependent states that can produce similar real-space modulations and apparent gaps; the manuscript provides no bulk-sensitive cross-check (e.g., neutron or resonant X-ray scattering) or quantitative comparison to surface-only models, leaving the bulk interpretation load-bearing but unverified.

    Authors: We agree that surface effects are an important consideration for STM studies of layered nickelates. Our data show that the four-unit-cell periodicity, the near-complete 66 meV gap, and the discrete phase slips above 20 meV are reproducible across multiple cleaved surfaces and samples. These features match the periodicity and gap magnitude reported in prior bulk-sensitive ARPES and optical studies on La4Ni3O10, and the spin-polarized contrast is consistent with the magnetic stripe order expected from bulk calculations. We will revise the manuscript to add a dedicated discussion paragraph that explicitly addresses possible surface reconstructions, oxygen-vacancy ordering, and termination-dependent states, including why such scenarios are inconsistent with the observed energy threshold for phase slips and the spin-polarized imaging. While we cannot add new neutron or resonant X-ray scattering data, we will strengthen the comparison to existing literature on bulk stripe order in this compound and note the limitations of purely surface-based interpretations. revision: partial

standing simulated objections not resolved
  • New bulk-sensitive cross-checks (neutron or resonant X-ray scattering) cannot be performed or added to this STM-focused study.

Circularity Check

0 steps flagged

No circularity: pure experimental imaging with direct measurements

full rationale

This is an experimental STM imaging study reporting observed real-space modulations, a ~66 meV gap, and ~20 meV threshold phase slips in La4Ni3O10. No derivations, models, fitted parameters, or equations are presented that reduce to the paper's own inputs by construction. Central claims rest on direct measurement and interpretation of data rather than any self-referential chain, self-citation load-bearing premise, or ansatz smuggled via prior work. The derivation chain is therefore self-contained with no circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that STM contrast directly maps intrinsic stripe order from correlation physics; no free parameters or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption Observed periodic modulations in STM topography and spectroscopy correspond to bulk stripe order driven by electron correlations rather than surface or tip artifacts.
    This interpretive step converts raw imaging data into the claim of stripe order resembling cuprates.

pith-pipeline@v0.9.0 · 5739 in / 1529 out tokens · 67331 ms · 2026-05-20T08:14:51.642618+00:00 · methodology

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