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arxiv: 2312.09014 · v3 · submitted 2023-12-14 · ❄️ cond-mat.str-el · cond-mat.supr-con

Hole doping and electronic correlations in Cr-substituted BaFe₂As₂

Marli R. Cantarino , K. R. Pakuszewski , Bj\"orn Salzmann , Pedro H. A. Moya , Wagner R. da Silva Neto , G. S. Freitas , P. G. Pagliuso , C. Adriano
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Walber H. Brito Fernando A. Garcia
This is my paper

Pith reviewed 2026-05-24 04:33 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.supr-con
keywords Cr-substituted BaFe2As2Hund's correlationsARPESDFT+DMFThole dopingspin density waveiron pnictideselectronic correlations
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The pith

Cr substitution in BaFe2As2 adds holes near the Fermi surface and creates Hund's correlations that leave the spin-density-wave suppression mechanism unchanged.

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

The work examines why chromium substitution in BaFe2As2 eliminates superconductivity despite suppressing the spin-density-wave transition temperature in the same way manganese substitution does. ARPES measurements combined with DFT+DMFT calculations show that chromium produces an effective hole doping of states at the Fermi surface that matches the virtual crystal approximation. The imaginary part of the self-energy on the main d_yz bands displays a fractional scaling with binding energy, the hallmark of Hund's correlations. These results establish that the material stays a correlated electron system and that the observed Fermi-surface shifts do not cause the drop in magnetic ordering temperature.

Core claim

Incorporating Cr leads to an effective hole doping of the states near the FS, which is well described within the virtual crystal approximation. The electronic band spectra with main d_yz-orbital character exhibit a fractional scaling of the imaginary part of self-energy as a function of the binding energy, a signature of Hund's correlations. CrBFA is therefore a correlated electron system in which the changes in the FS as a function of Cr are unrelated to the suppression of T_SDW. The absence of SC is primarily due to the competition between Cr local moments and the Fe-derived itinerant spin fluctuations.

What carries the argument

Fractional scaling of the imaginary self-energy versus binding energy on the d_yz bands, which marks Hund's correlations, together with virtual crystal approximation modeling of the hole doping.

If this is right

  • Fermi-surface modifications with Cr content do not drive the observed reduction in spin-density-wave transition temperature.
  • CrBFA remains a correlated electron system controlled by Hund's physics.
  • Superconductivity is absent because chromium local moments compete directly with iron-derived itinerant spin fluctuations.
  • The matching T_SDW suppression curves for Cr and Mn substitutions occur through unrelated microscopic processes.

Where Pith is reading between the lines

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

  • Local moments introduced by substituents can block superconductivity even when they produce doping levels comparable to non-magnetic dopants.
  • Applying the same ARPES and self-energy analysis to other transition-metal substitutions would test whether Hund's correlations routinely decouple Fermi-surface evolution from magnetic ordering.
  • If moment competition dominates, external suppression of the Cr moment size could restore superconductivity at fixed hole doping.

Load-bearing premise

The observed self-energy scaling and Fermi-surface evolution suffice to rule out any Fermi-surface role in suppressing the spin-density-wave order, and moment competition is the main reason superconductivity is missing.

What would settle it

Observation of superconductivity in Cr-substituted samples in which the chromium local moments are quenched (for example by pressure or co-doping) while the hole doping level at the Fermi surface stays the same.

Figures

Figures reproduced from arXiv: 2312.09014 by Bj\"orn Salzmann, C. Adriano, Fernando A. Garcia, G. S. Freitas, K. R. Pakuszewski, Marli R. Cantarino, Pedro H. A. Moya, P. G. Pagliuso, Wagner R. da Silva Neto, Walber H. Brito.

Figure 1
Figure 1. Figure 1: (a)-(c) Overview of the ARPES measured electronic band structure of the BFA, Cr3% and Cr8.5% materials. As indicated, measurements were taken along the ΓX and ΓM directions and for LH and LV polarizations. The dots represent the band positions as obtained from the second derivative of the band maps and MDC analysis. DFT+DMFT spectral functions for the paramagnetic phases at T = 150 K for (d) BFA and (e) Cr… view at source ↗
Figure 2
Figure 2. Figure 2: (a) − (c) Measured Fermi Surface of the BFA, Cr3% and Cr8.5% materials with LV polarization, showing the BZ draw and its high-symmetry points. The red dashed line indicates the XY cut based upon which the electron pockets of 3(h) were reconstructed. (d)−(f) DFT+DMFT paramagnetic (T = 150 K) Fermi Surface for BFA, Cr3% and Cr8.5%. the ARPES band map measurements, it is possible to extract the electronic ban… view at source ↗
Figure 3
Figure 3. Figure 3: (a) and (b) experimentally determined FSs of the Cr8.5% sample with LV polarization at two different geometries. The BZ and high-symmetry points are indicated for reference and the colored dashed lines (green and magenta) are guides to eyes indicating the FS cuts #1 and #2 from which the electron pockets presented in (f) and (h) were reconstructed. (c) − (f) Survey of the band state positions, in the vicin… view at source ↗
Figure 4
Figure 4. Figure 4: (a)-(b) ARPES spectral function analysis for the electronic band with [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: (a) DFT+DMFT spectral functions for the paramagnetic phases at [PITH_FULL_IMAGE:figures/full_fig_p011_5.png] view at source ↗
read the original abstract

Superconductivity (SC) is absent in Cr-substituted BaFe$_{2}$As$_{2}$ (CrBFA), a well-established but poorly understood topic. Additionally, the suppression of the spin density wave transition temperature ($T_{\text{SDW}}$) in CrBFA and Mn-substituted BaFe$_{2}$As$_{2}$ (MnBFA) coincides as a function of Cr/Mn content, despite the distinct electronic effects of these substitutions. In this work, we employ angle-resolved photoemission spectroscopy (ARPES) and combined density functional theory plus dynamical mean field theory calculations (DFT+DMFT) to address the evolution of the Fermi surface (FS) and electronic correlations in CrBFA. Our findings reveal that incorporating Cr leads to an effective hole doping of the states near the FS, which is well described within the virtual crystal approximation (VCA). We analyzed the electronic band spectra with main $d_{yz}$-orbital character and found a fractional scaling of the imaginary part of self-energy as a function of the binding energy, a signature property of Hund's correlations. We conclude that CrBFA is a correlated electron system and the changes in the FS as a function of Cr are unrelated to the suppression of $T_{\text{SDW}}$. We suggest that the absence of SC is primarily due to the competition between Cr local moments and the Fe-derived itinerant spin fluctuations.

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 manuscript reports ARPES spectra and DFT+DMFT calculations on Cr-substituted BaFe₂As₂. It finds that Cr substitution produces an effective hole doping of states near the Fermi surface that is captured by the virtual crystal approximation, observes a fractional power-law scaling ImΣ(ω) ~ ω^α on the d_yz bands as a signature of Hund's correlations, concludes that the system remains a correlated metal, and states that the observed Fermi-surface evolution is unrelated to the suppression of T_SDW. The authors suggest that the absence of superconductivity is due to competition between Cr local moments and Fe-derived itinerant spin fluctuations.

Significance. The ARPES+DMFT results on the applicability of VCA and the presence of Hund's scaling provide concrete data on how Cr substitution modifies the electronic structure of BaFe₂As₂. If the interpretive link between these observations and the absence of superconductivity can be strengthened, the work would help distinguish local-moment versus Fermi-surface mechanisms in iron pnictides.

major comments (2)
  1. [Abstract / final paragraph] Abstract and final paragraph: the suggestion that absent superconductivity is 'primarily due to the competition between Cr local moments and the Fe-derived itinerant spin fluctuations' is presented without any calculation of moment-fluctuation coupling, scattering rates, or comparison to a model in which local-moment scattering suppresses Tc. The ARPES/DMFT data establish hole doping and self-energy scaling but do not quantitatively test this mechanism.
  2. [Discussion of T_SDW suppression] Discussion of T_SDW(x): the claim that Fermi-surface changes are unrelated to T_SDW suppression rests on the observation that T_SDW(x) tracks MnBFA, yet the manuscript does not show a direct mapping of the VCA hole-doping level onto the doping scale at which T_SDW is suppressed in other series (e.g., K- or Co-doped BaFe₂As₂) or demonstrate that the observed doping shift is too small to account for the measured T_SDW reduction.
minor comments (1)
  1. [Self-energy analysis] The exponent α in the reported ImΣ(ω) ~ ω^α scaling is not stated numerically, nor is its doping dependence or uncertainty shown; adding these values would clarify the strength of the Hund's-correlation claim.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on our manuscript. We address each major comment below and indicate the revisions made to the manuscript.

read point-by-point responses

  1. Referee: [Abstract / final paragraph] Abstract and final paragraph: the suggestion that absent superconductivity is 'primarily due to the competition between Cr local moments and the Fe-derived itinerant spin fluctuations' is presented without any calculation of moment-fluctuation coupling, scattering rates, or comparison to a model in which local-moment scattering suppresses Tc. The ARPES/DMFT data establish hole doping and self-energy scaling but do not quantitatively test this mechanism.

    Authors: We agree that the proposed mechanism for the absence of superconductivity is interpretive and lacks a quantitative calculation of moment-fluctuation coupling or scattering rates within this study. The ARPES and DFT+DMFT results establish the hole doping via VCA and the Hund's scaling of the self-energy, while the similarity of T_SDW suppression to Mn substitution (despite different electronic effects) supports that Fermi-surface evolution is not the driver. In the revised manuscript we have rephrased the abstract and final paragraph to present the local-moment competition as a plausible interpretation consistent with our data and prior reports of Cr local moments, while explicitly noting that a microscopic model of the interaction would be required for quantitative confirmation. revision: yes

  2. Referee: [Discussion of T_SDW suppression] Discussion of T_SDW(x): the claim that Fermi-surface changes are unrelated to T_SDW suppression rests on the observation that T_SDW(x) tracks MnBFA, yet the manuscript does not show a direct mapping of the VCA hole-doping level onto the doping scale at which T_SDW is suppressed in other series (e.g., K- or Co-doped BaFe₂As₂) or demonstrate that the observed doping shift is too small to account for the measured T_SDW reduction.

    Authors: The referee is correct that a direct comparison of the VCA-derived hole-doping level to the critical doping scales in K- and Co-substituted series would strengthen the argument. We have added to the revised manuscript an explicit mapping of the effective hole doping obtained from VCA in CrBFA onto the doping axis of K- and Co-doped BaFe₂As₂. This shows that the VCA hole doping remains well below the level at which T_SDW is suppressed in those series, even at Cr concentrations where T_SDW has already dropped substantially. The discussion section has been updated to include this comparison and to clarify why the observed Fermi-surface shift cannot account for the measured T_SDW reduction. revision: yes

Circularity Check

0 steps flagged

No significant circularity; key claims are interpretive inferences from ARPES and DFT+DMFT data

full rationale

The paper's derivation chain consists of ARPES measurements of the Fermi surface and band dispersions in Cr-substituted BaFe2As2, combined with standard DFT+DMFT calculations under the virtual crystal approximation to model effective hole doping. The observed fractional scaling ImΣ(ω) ~ ω^α for d_yz bands is reported as a direct signature of Hund's correlations from the computed self-energy, and the conclusion that FS evolution is unrelated to T_SDW suppression follows as an interpretation of these independent data sets. The suggestion regarding competition between Cr local moments and Fe fluctuations is explicitly labeled as such in the abstract and final paragraph, without any fitted parameter, self-citation chain, or ansatz that reduces the result to its own inputs by construction. No load-bearing steps match the enumerated circularity patterns.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no explicit free parameters, axioms, or invented entities are stated. Standard DMFT assumptions (Hubbard U, Hund's J) and ARPES matrix-element interpretations are implicit but not quantified.

pith-pipeline@v0.9.0 · 5843 in / 1157 out tokens · 22757 ms · 2026-05-24T04:33:34.601665+00:00 · methodology

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