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arxiv: 2604.10105 · v1 · submitted 2026-04-11 · ❄️ cond-mat.str-el

Comment on arXiv:2510.13767; Structural origin of resonant diffraction in RuO₂ (DOI: 10.1103/yr5q-1v1s)

Stephen W. Lovesey This is my paper

Pith reviewed 2026-05-10 15:57 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords resonant x-ray diffractionRuO2scattering amplitudesaltermagnetBragg diffractionrutile magnetismstructural origin
0
0 comments X

The pith

Scattering amplitudes in a recent RuO2 altermagnet study are incorrect and ignore prior correct results.

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

This comment identifies serious errors in the scattering amplitudes used to interpret resonant x-ray Bragg diffraction measurements on RuO2, a candidate altermagnet. The amplitudes appearing in the main text and supplementary material reproduce erroneous expressions from a 2019 publication rather than the correct ones published in 2022. Because of this mismatch, the original paper's concluding statements about the structural origin of the diffraction signals are misleading. A reader would care because resonant x-ray diffraction is a key tool for probing magnetism, and wrong amplitudes can lead to incorrect inferences about magnetic structures in rutile compounds.

Core claim

Occhialini et al. use incorrect scattering amplitudes for resonant x-ray Bragg diffraction in their analysis of RuO2, drawing on erroneous expressions from Phys. Rev. Lett. 122, 017202 instead of the correct results in Phys. Rev. B 105, 014403. This error appears in Eqs. 14 and 16 of the main text and SM, rendering the concluding statement and Footnote SM [54] misleading.

What carries the argument

Resonant x-ray Bragg diffraction scattering amplitudes (Eqs. 14 and 16), which interpret the measured signals but are shown to match prior wrong expressions rather than the established correct ones.

If this is right

  • The interpretation of the resonant diffraction data on RuO2 must be revised using correct amplitudes.
  • Claims about the structural origin of the observed signals no longer hold as presented.
  • Conclusions on bulk magnetism and altermagnetism in the rutile compound require re-evaluation.
  • The footnote referencing the amplitudes is invalid and should be corrected.

Where Pith is reading between the lines

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

  • Applying the correct 2022 amplitudes could alter the extracted magnetic structure parameters from the same experimental data.
  • This case illustrates a broader need to verify amplitude calculations when interpreting resonant x-ray results in other candidate altermagnets.
  • Future diffraction studies on RuO2 or similar materials should cite and use the Phys. Rev. B 105, 014403 expressions as the baseline.

Load-bearing premise

That the amplitudes from Phys. Rev. B 105, 014403 are the correct reference expressions that directly contradict and should replace those used in the critiqued paper.

What would settle it

A side-by-side comparison or independent re-derivation of the amplitude formulas in Eqs. 14 and 16 against the expressions derived in Phys. Rev. B 105, 014403 to verify whether they match or differ.

read the original abstract

Occhialini et al. (arXiv:2510.13767; DOI: 10.1103/yr5q-1v1s) add results to several recent experimental studies of bulk magnetism in the rutile compound RuO_2. It is of interest as a candidate altermagnet. The cited publication contains several serious errors. Notably, scattering amplitudes used to interpret measurements accomplished with resonant x-ray Bragg diffraction, which appear in the main text and SM (Eqs. 14 & 16), are wrong. The authors tender erroneous amplitudes (Phys. Rev. Lett. 122, 017202) and thereby ignore previously published correct results (Phys. Rev. B 105, 014403). As a result, the concluding statement and Footnote SM [54] are misleading.

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. This manuscript is a comment on arXiv:2510.13767 by Occhialini et al. It claims that the scattering amplitudes used to interpret resonant x-ray Bragg diffraction measurements on RuO2, appearing in the main text and SM as Eqs. (14) and (16), are erroneous. These amplitudes follow incorrect expressions from Phys. Rev. Lett. 122, 017202 and ignore the correct results from Phys. Rev. B 105, 014403, rendering the concluding statement and Footnote SM [54] misleading.

Significance. If the claimed discrepancy in scattering amplitudes holds, the comment would be significant for correcting the analysis of resonant diffraction data on RuO2, a candidate altermagnet, and for emphasizing the use of accurate amplitudes in such experiments. The manuscript provides no independent derivation or explicit comparison of the expressions, so its impact depends on the validity of the two cited prior publications.

major comments (1)
  1. The central claim that Eqs. (14) and (16) match the erroneous amplitudes from Phys. Rev. Lett. 122, 017202 (and differ from those in Phys. Rev. B 105, 014403) is made entirely by reference without quoting the expressions, showing term-by-term differences, or re-deriving the amplitudes for the RuO2 resonant Bragg geometry. This is load-bearing for the manuscript's assertion, as the comment offers no self-contained verification.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their review and constructive comment on our manuscript. We address the major point below and agree that an explicit comparison will improve clarity.

read point-by-point responses

  1. Referee: The central claim that Eqs. (14) and (16) match the erroneous amplitudes from Phys. Rev. Lett. 122, 017202 (and differ from those in Phys. Rev. B 105, 014403) is made entirely by reference without quoting the expressions, showing term-by-term differences, or re-deriving the amplitudes for the RuO2 resonant Bragg geometry. This is load-bearing for the manuscript's assertion, as the comment offers no self-contained verification.

    Authors: We acknowledge that the current version relies on citations to the two prior publications for the amplitude expressions. To make the discrepancy self-evident, we will revise the manuscript to quote the relevant scattering amplitude expressions from Phys. Rev. Lett. 122, 017202 and Phys. Rev. B 105, 014403, followed by a term-by-term comparison that isolates the differing contributions. This comparison will be tailored to the resonant Bragg geometry relevant to RuO2. While a full independent re-derivation exceeds the scope of a concise comment, the explicit side-by-side presentation will allow readers to verify the central claim directly from the revised text without needing to consult the original references. revision: yes

Circularity Check

0 steps flagged

No derivation chain or self-referential reduction; comment defers to external published results

full rationale

The manuscript is a short comment with no equations, no derivations, and no fitted parameters or predictions of its own. Its central claim—that scattering amplitudes in the critiqued paper (Eqs. 14 and 16) are erroneous—rests on citations to two prior publications (PRL 122, 017202 and PRB 105, 014403) rather than any internal reduction or construction. Per the guidelines, a citation to independently published work (even with author overlap) supplies external support and does not create circularity when the present paper performs no derivation that could loop back to its inputs. No load-bearing step reduces by construction to a self-definition, fit, or ansatz within this document.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The comment introduces no free parameters, axioms, or invented entities; its central point rests entirely on the accuracy of two previously published papers on scattering amplitudes.

pith-pipeline@v0.9.0 · 5456 in / 1040 out tokens · 18412 ms · 2026-05-10T15:57:45.352990+00:00 · methodology

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Reference graph

Works this paper leans on

11 extracted references · 11 canonical work pages

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