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arxiv: 2606.17663 · v1 · pith:K5THW3HKnew · submitted 2026-06-16 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Probing La-based nickelates with Ni 1s core-level photoelectron spectroscopy

Daisuke Takegami , Naoki Ito , Koto Fujinuma , Masato Yoshimura , Grace A. Pan , Dan Ferenc Segedin , Qi Song , Hanjong Paik
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Charles M. Brooks Hanjie Guo Alexander C. Komarek Takanori Taniguchi Masaki Fujita Julia A. Mundy Takashi Mizokawa Liu Hao Tjeng Berit H. Goodge Atsushi Hariki
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classification ❄️ cond-mat.str-el cond-mat.mtrl-sci
keywords nickelatesphotoemission spectroscopycore levelsNi 1sRuddlesden-Popper seriesLa3Ni2O7strongly correlated electrons
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The pith

Ni 1s core levels provide a clean view of intrinsic electronic excitations in La-based nickelates by avoiding La 3d overlap.

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

The paper compares Ni 2p and Ni 1s photoemission spectra from La3Ni2O7, Nd3Ni2O7, and LaNiO3. Ni 2p lines overlap in energy with La 3d, which hinders analysis of the nickel electronic structure. The deeper Ni 1s level sidesteps this overlap and isolates the intrinsic excitations. This approach is presented as useful for distinguishing electronic details across the Ruddlesden-Popper series La_{n+1}Ni_nO_{3n+1}. A reader would care because these compounds are studied as models of strong electron correlations.

Core claim

The authors show through direct comparison that Ni 1s core-level photoelectron spectra in these nickelates deliver a clean view on the intrinsic electronic excitations, free from the substantial La 3d overlap that affects the commonly used Ni 2p spectra, and they note the potential of this probe to resolve detailed differences in electronic structure within the strongly correlated Ruddlesden-Popper series.

What carries the argument

Ni 1s core-level photoelectron spectroscopy, which isolates nickel electronic excitations by lying outside the energy range of La 3d levels.

If this is right

  • Detailed electronic differences can be resolved across compounds in the La_{n+1}Ni_nO_{3n+1} series.
  • Comparative analysis of La3Ni2O7 and LaNiO3 becomes more straightforward without spectral interference.
  • The method supports systematic studies of other members of the Ruddlesden-Popper nickelate family.

Where Pith is reading between the lines

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

  • The clean Ni 1s probe could track how doping or strain modifies excitations in these nickelates.
  • Similar deep-core strategies might clarify electronic structure in other transition-metal oxides where core-level overlaps occur.
  • This technique offers a route to more precise extraction of valence and correlation parameters from photoemission data.

Load-bearing premise

The Ni 1s spectra are free from other overlaps, matrix effects, or experimental artifacts that would prevent them from reflecting the intrinsic electronic excitations.

What would settle it

If measured Ni 1s spectra exhibit features that fail to match independent calculations of the nickel electronic structure or results from alternative non-overlapping probes, the claim of a clean view would not hold.

Figures

Figures reproduced from arXiv: 2606.17663 by Alexander C. Komarek, Atsushi Hariki, Berit H. Goodge, Charles M. Brooks, Daisuke Takegami, Dan Ferenc Segedin, Grace A. Pan, Hanjie Guo, Hanjong Paik, Julia A. Mundy, Koto Fujinuma, Liu Hao Tjeng, Masaki Fujita, Masato Yoshimura, Naoki Ito, Qi Song, Takanori Taniguchi, Takashi Mizokawa.

Figure 1
Figure 1. Figure 1: shows (a) the Ni 2p spectra of Nd3Ni2O7 from reference [13], together with the Ni 2p and La 3d spectra of (b) La3Ni2O7 and (c) LaNiO3. Consistent with pre￾vious reports in the literature [36–38], two sets of La 3d double peaked core levels [56] are observed in the La￾containing nickelates, with the La 3d3/2 fully overlap￾ping with the Ni 2p3/2. Here we also observe that the La 3d5/2 core level is noticeabl… view at source ↗
Figure 3
Figure 3. Figure 3: shows the Ni 1s spectra of Nd3Ni2O7, La3Ni2O7, and LaNiO3. While the overall line shapes and satellite structures are rather similar, the Ni 1s spec￾tra do show material-dependent variations. First of all, we observe that there is a clear distinction between bi￾layer compounds Nd3Ni2O7 and La3Ni2O7 as compared to perovskite LaNiO3. LaNiO3 displays a much more asymmetric main peak at a lower energy, and a w… view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) DFT+DMFT calculations of the Ni core-level [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
read the original abstract

We present a comparative Ni core level photoemission study of La$_3$Ni$_2$O$_7$, Nd$_3$Ni$_2$O$_7$, and LaNiO$_3$ using both the Ni $2p$ and the Ni $1s$. We address the challenges in analyzing the widely investigated Ni $2p$ spectra arising from the substantial overlap in energy of the Ni $2p$ with the La $3d$. We show that on the other hand the deep Ni $1s$ core level does provide a clean view on the intrinsic electronic excitations and we highlight its potential to resolve detailed differences in the electronic structure within the strongly correlated Ruddlesden-Popper series La$_{n+1}$Ni$_n$O$_{3n+1}$.

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

0 major / 3 minor

Summary. The manuscript presents comparative Ni 2p and Ni 1s core-level photoelectron spectra for La₃Ni₂O₇, Nd₃Ni₂O₇, and LaNiO₃. It argues that the substantial energy overlap between Ni 2p and La 3d compromises analysis of the former, while the deeper Ni 1s level avoids this overlap and thereby supplies a cleaner probe of intrinsic electronic excitations in the La_{n+1}Ni_nO_{3n+1} Ruddlesden-Popper series.

Significance. If the Ni 1s spectra are shown to be free of La 3d overlap and other artifacts while resolving series-specific differences, the work would supply a practical experimental route for studying electronic structure in these nickelates without the usual peak-overlap complications.

minor comments (3)
  1. §3 (Experimental details): the photon energy, analyzer resolution, and sample surface preparation protocol for the Ni 1s measurements should be stated explicitly so that the claimed absence of overlap can be assessed against possible matrix-element or escape-depth effects.
  2. Figure 2 (Ni 1s spectra): the energy scale and background subtraction procedure are not described; adding these would allow readers to verify that the reported line shapes are intrinsic rather than artifactual.
  3. The abstract and §4 claim the Ni 1s spectra 'resolve detailed differences' within the series, yet no quantitative metric (e.g., peak-position shifts or satellite intensity ratios with error bars) is provided to support this statement.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their review and for recommending minor revision. The referee summary accurately captures the scope and conclusions of our work on Ni 1s versus Ni 2p core-level photoemission in La-based nickelates.

Circularity Check

0 steps flagged

No significant circularity; purely experimental comparison

full rationale

The manuscript is an experimental photoelectron spectroscopy study comparing Ni 1s and Ni 2p spectra across La3Ni2O7, Nd3Ni2O7, and LaNiO3. The central claim rests on direct observation that Ni 1s avoids La 3d overlap present in Ni 2p, demonstrated by the presented spectra themselves. No equations, derivations, fitted parameters renamed as predictions, or self-citation chains appear. The result is self-contained and externally falsifiable via the raw data.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no free parameters, axioms, or invented entities are described.

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discussion (0)

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Reference graph

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