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arxiv: 2605.16988 · v1 · pith:RFKB3VWKnew · submitted 2026-05-16 · ❄️ cond-mat.supr-con · cond-mat.str-el

Incommensurate Antiferromagnetic Order in the Fe-substituted Bi-2201 Cuprate in the Heavily Overdoped Regime

Y. Komiyama , Y. Ikeda , T. Taniguchi , T. J. Williams , M. Matsuda , S. Asai , T. Masuda , H. Kuwahara
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H. Kuroe T. Kawamata I. Watanabe M. Fujita T. Adachi
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Pith reviewed 2026-05-19 18:42 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords cupratesantiferromagnetic orderneutron scatteringBi-2201overdoped regimeincommensurate orderiron substitutionsuperconductivity
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The pith

Iron substitution induces incommensurate antiferromagnetic order in heavily overdoped non-superconducting Bi-2201.

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

Elastic neutron scattering on 5 percent iron-substituted Bi-2201 detects incommensurate antiferromagnetic peaks in the non-superconducting heavily overdoped regime. The incommensurability of roughly 0.21 matches values seen in the overdoped regime, and the magnetic correlation length stays similar. The results indicate that iron can induce and stabilize this order even after superconductivity vanishes, pointing to antiferromagnetic correlations that extend past the superconducting dome.

Core claim

Elastic neutron scattering experiments showed incommensurate antiferromagnetic peaks in 5% Fe-substituted Bi-2201 cuprate in the non-superconducting heavily overdoped regime. The incommensurability delta~0.21 is comparable to that observed in Fe-substituted Bi-2201 in the overdoped regime. The magnetic correlation length is comparable between the overdoped and non-superconducting heavily overdoped regimes.

What carries the argument

Incommensurate antiferromagnetic peaks from elastic neutron scattering, which reveal order stabilized by iron substitution.

If this is right

  • Incommensurate antiferromagnetic order can be induced and stabilized by iron in the heavily overdoped regime.
  • Antiferromagnetic correlations remain robust beyond the superconducting dome in the phase diagram.
  • The magnetic correlation length and incommensurability stay comparable to those in the overdoped regime.
  • Iron substitution offers a way to access antiferromagnetic order in cuprates that lack superconductivity.

Where Pith is reading between the lines

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

  • This persistence may mean magnetism influences normal-state properties even deep in the overdoped region.
  • Testing other cuprate families with similar iron doping could show whether the effect is widespread.
  • The work raises the possibility that the antiferromagnetic phase boundary extends further than the superconducting dome in standard phase diagrams.
  • Future measurements at varying iron concentrations could map how much substitution is needed to stabilize the order.

Load-bearing premise

The peaks come from iron stabilizing antiferromagnetic order rather than from uneven doping, sample problems, or measurement issues.

What would settle it

Repeating the neutron scattering on pure Bi-2201 without iron in the same heavily overdoped regime and finding no incommensurate peaks would support that iron is required to induce the order.

Figures

Figures reproduced from arXiv: 2605.16988 by H. Kuroe, H. Kuwahara, I. Watanabe, M. Fujita, M. Matsuda, S. Asai, T. Adachi, T. J. Williams, T. Kawamata, T. Masuda, T. Taniguchi, Y. Ikeda, Y. Komiyama.

Figure 1
Figure 1. Figure 1: (Color online) Difference profile obtained by subtracting the data at 50 K from those at 12 K in HOD Bi1.74Pb0.38Sr1.88Cu1−yFeyO6+d with y = 0.05 (p = 0.29) using TOPAN. Inset shows the scan trajectory in the reciprocal (h, k) plane of the orthorhombic notation. Solid line is a fitting result using Eq. (1). using the Lindhard susceptibility based on the Fermi sur￾face, which suggested that the IC-AFM order… view at source ↗
Figure 2
Figure 2. Figure 2 [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (a) shows the hole-concentration dependence of δ in HOD Bi1.74Pb0.38Sr1.88Cu1−yFeyO6+d (y = 0.05) obtained with TOPAN, HER, and HB-3, together with overdoped Bi1.75Pb0.35Sr1.90Cu1−yFeyO6+d (y = 0.09) ob￾tained by analysis using Eq. (1),32) La2−xBaxCuO4, 37–39) La2−xSrxCuO4, 8, 40–42) La1.6−xNd0.4SrxCuO4 43–46) and La2−xSrxCu1−yFeyO4 (y = 0.01)31) obtained in the elas￾tic scans, and Bi2+xSr2−xCuO6+d 47) and… view at source ↗
read the original abstract

Elastic neutron scattering experiments showed incommensurate antiferromagnetic peaks in 5% Fe-substituted Bi-2201 cuprate in the non-superconducting heavily overdoped regime. The incommensurability delta~0.21 is comparable to that observed in Fe-substituted Bi-2201 in the overdoped regime. [Hiraka et al., Phys. Rev. B 81, 144501 (2010).] The magnetic correlation length is comparable between the overdoped and non-superconducting heavily overdoped regimes. It is plausible that incommensurate antiferromagnetic order is induced and stabilized by Fe in the heavily overdoped regime, which suggests a robust antiferromagnetic correlation beyond the superconducting dome in the phase diagram.

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

2 major / 1 minor

Summary. The paper reports elastic neutron scattering experiments on 5% Fe-substituted Bi-2201 cuprate in the non-superconducting heavily overdoped regime. It observes incommensurate antiferromagnetic peaks with incommensurability δ ≈ 0.21, comparable to prior observations in Fe-substituted Bi-2201 in the overdoped regime (Hiraka et al., Phys. Rev. B 81, 144501 (2010)). The magnetic correlation length is also comparable between the two regimes, leading to the suggestion that incommensurate antiferromagnetic order is induced and stabilized by Fe, implying robust AF correlations beyond the superconducting dome.

Significance. If the observations and interpretation hold, the result would indicate that antiferromagnetic correlations persist and can be stabilized in the heavily overdoped regime of the cuprate phase diagram, even where superconductivity is absent. This has potential implications for understanding the normal-state properties and the interplay between magnetism and doping in high-Tc materials. The experimental comparison to existing Fe-substituted data is a positive aspect.

major comments (2)
  1. [Results/Discussion] Results/Discussion: The claim that the incommensurate AF order (δ ~ 0.21) is specifically induced and stabilized by Fe substitution lacks support from a direct control comparison to Fe-free Bi-2201 at equivalent heavily overdoped doping. The manuscript compares only to other Fe-substituted overdoped samples; without this contrast, doping-induced stripe-like correlations, oxygen inhomogeneity, or impurity scattering cannot be excluded as origins of the peaks and comparable correlation lengths. This is load-bearing for the central interpretation.
  2. [Experimental Methods] Experimental Methods: The manuscript provides no details on data reduction procedures, background subtraction, error analysis, or sample characterization (e.g., confirmation of the actual doping level and homogeneity in the heavily overdoped regime). These omissions make it difficult to fully assess the reliability of the reported peaks and the stabilization claim.
minor comments (1)
  1. [Abstract] The abstract and text use 'comparable' for the correlation length without quoting specific values or uncertainties from the current or prior measurements; adding these would aid quantitative assessment.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments on our manuscript. We address the major comments point by point below and outline the revisions we plan to make.

read point-by-point responses

  1. Referee: [Results/Discussion] The claim that the incommensurate AF order (δ ~ 0.21) is specifically induced and stabilized by Fe substitution lacks support from a direct control comparison to Fe-free Bi-2201 at equivalent heavily overdoped doping. The manuscript compares only to other Fe-substituted overdoped samples; without this contrast, doping-induced stripe-like correlations, oxygen inhomogeneity, or impurity scattering cannot be excluded as origins of the peaks and comparable correlation lengths. This is load-bearing for the central interpretation.

    Authors: We agree that a direct comparison to Fe-free Bi-2201 at the same heavily overdoped doping level would provide stronger evidence for the specific role of Fe. The manuscript compares the observed δ ≈ 0.21 and correlation length to the Fe-substituted overdoped samples in Hiraka et al. (Phys. Rev. B 81, 144501 (2010)) and uses the cautious phrasing 'it is plausible'. We do not have a Fe-free control sample in this study. In the revised manuscript we will expand the discussion to explicitly note the lack of this control, acknowledge that alternative origins such as doping-induced correlations or inhomogeneity cannot be ruled out, and reframe the suggestion of Fe stabilization as tentative rather than definitive. This will reduce the load-bearing nature of the claim while preserving the observational result. revision: partial

  2. Referee: [Experimental Methods] The manuscript provides no details on data reduction procedures, background subtraction, error analysis, or sample characterization (e.g., confirmation of the actual doping level and homogeneity in the heavily overdoped regime). These omissions make it difficult to fully assess the reliability of the reported peaks and the stabilization claim.

    Authors: We thank the referee for identifying these omissions. In the revised version we will add a dedicated subsection in the Experimental Methods (or supplementary material with explicit reference in the main text) that details the data reduction procedures, background subtraction, error analysis, and sample characterization, including confirmation of the doping level and homogeneity via the methods used in the experiment. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental report with external literature comparisons

full rationale

This is a straightforward experimental neutron scattering study reporting observed incommensurate antiferromagnetic peaks in Fe-substituted Bi-2201. The manuscript contains no equations, derivations, fitted parameters, or ansatzes. All comparisons are to independent prior literature (e.g., Hiraka et al. 2010) that is externally falsifiable and does not overlap with the present authors. The central interpretation is presented as plausible based on the new data and existing benchmarks rather than reducing to any self-defined input or self-citation chain. The paper is self-contained against external experimental benchmarks with no load-bearing steps that collapse by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper is an experimental observation report. It relies on standard condensed-matter assumptions for interpreting neutron scattering peaks as magnetic order but introduces no fitted parameters, new axioms, or postulated entities.

axioms (1)
  • standard math Standard interpretation of elastic neutron scattering peaks as signatures of long-range or short-range antiferromagnetic order in cuprate lattices.
    The identification of incommensurate peaks and extraction of delta and correlation length presuppose conventional data analysis methods in the field.

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