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REVIEW 2 major objections 2 minor 53 references

In the charge-ordered altermagnet α-Fe₂PO₅, doping activates spin-polarized transport through distinct Fe²⁺ and Fe³⁺ channels carrying opposite polarizations on the antiferromagnetic sublattices.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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2026-07-02 10:39 UTC pith:2RCPSIXF

load-bearing objection The paper's main claim is real-space atom-selective spin transport in α-Fe₂PO₅ from charge order plus C-type AFM stacking, but the isolation of Fe²⁺/Fe³⁺ channels rests on an unquantified suppression of inter-sublattice transmission. the 2 major comments →

arxiv 2607.00506 v1 pith:2RCPSIXF submitted 2026-07-01 cond-mat.mtrl-sci cond-mat.mes-hall

Atom-selective spin-polarized transport in a charge-ordered altermagnet

Liu Yang , Yuan-Yuan Jiang , Xiao-Yan Guo , Yi-Dong Liu , Xian-Zhe Chen , Wen-Jian Lu , Yu-Ping Sun , Ming Li
show 1 more author
Ding-Fu Shao
This is my paper
classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords altermagnetspin-polarized transportcharge orderα-Fe₂PO₅tunnel junctionantiferromagnetspin selectivitydoping
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

The paper establishes that charge order in α-Fe₂PO₅ creates inequivalent iron sites that enable real-space spin selectivity even when momentum-space splitting is weak. Calculations show that electron doping routes current mainly through Fe³⁺ sites while hole doping uses Fe²⁺ sites. These channels reside on separate sublattices with opposite spin directions, producing a net charge current that carries hidden spin character. This also supports a tunnel junction design where channel matching controls conductance by orders of magnitude.

Core claim

Using first-principles calculations and quantum transport simulations, the work demonstrates that the charge-ordered altermagnet α-Fe₂PO₅ exhibits real-space spin selectivity. The charge order produces inequivalent Fe²⁺ and Fe³⁺ sites within each sublattice, and the puckered C-type antiferromagnetic stacking suppresses inter-sublattice transport. Consequently, electron doping activates spin-polarized transport predominantly through Fe³⁺-based channels and hole doping through Fe²⁺-based channels. These atom-selective channels carry opposite spin polarizations on the two antiferromagnetic sublattices, resulting in a globally compensated charge current with hidden Néel spin character. An all-in

What carries the argument

The atom-selective conduction channels formed by inequivalent Fe²⁺ and Fe³⁺ sites within each antiferromagnetic sublattice, isolated by the puckered C-type stacking.

Load-bearing premise

The puckered C-type antiferromagnetic stacking sufficiently suppresses inter-sublattice transport to keep the atom-selective channels isolated within each sublattice.

What would settle it

Transport measurements in doped α-Fe₂PO₅ showing either no spin polarization or the same polarization direction on both sublattices would falsify the atom-selective mechanism.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • Electron doping activates predominantly Fe³⁺-based spin-polarized transport.
  • Hole doping activates Fe²⁺-based channels with opposite spin polarization.
  • The current remains globally compensated while carrying hidden Néel spin character.
  • An all-in-one tunnel junction achieves orders-of-magnitude conductance modulation via channel matching or mismatching.

Where Pith is reading between the lines

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

  • This mechanism may extend to other charge-ordered altermagnets as a general route for atomic-scale spin control.
  • Selective doping could be used to design spintronic devices that operate without external fields or strong magnetic splitting.
  • Similar structures in related compounds might be tested to confirm if charge order reliably produces such selectivity.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 2 minor

Summary. The manuscript claims that the charge-ordered altermagnet α-Fe₂PO₅ exhibits real-space atom-selective spin-polarized transport: despite weak momentum-space altermagnetic splitting near E_F, the combination of Fe²⁺/Fe³⁺ charge order and puckered C-type AFM stacking isolates conduction channels so that electron doping activates spin-polarized transport through Fe³⁺ sites and hole doping through Fe²⁺ sites, each carrying opposite Néel spin polarization on the two AFM sublattices. This hidden spin character is proposed to enable an all-in-one tunnel junction with orders-of-magnitude conductance modulation between matched and mismatched channel configurations. The results rest on first-principles electronic-structure calculations and quantum-transport simulations.

Significance. If the atom-selective isolation holds, the work supplies a concrete real-space route to compensated spin-polarized currents and device functionality that does not rely on large k-space spin splitting, complementing existing altermagnet literature. The use of parameter-free DFT plus explicit transport simulations is a strength; the proposed tunnel-junction geometry is falsifiable and directly testable.

major comments (2)
  1. [§3.2] §3.2 (or equivalent transport-results section): the central claim that puckered C-type AFM stacking 'suppresses inter-sublattice transport' is load-bearing for the atom-selective mechanism, yet no quantitative bounds are given on residual inter-sublattice transmission probabilities or hopping matrix elements once the Fermi level is shifted by doping. If these matrix elements remain comparable to intra-sublattice ones, the isolation of Fe²⁺/Fe³⁺ channels and the hidden Néel character both fail.
  2. [Fig. 4] Fig. 4 (or equivalent conductance plot): the reported orders-of-magnitude modulation in the proposed tunnel junction is presented without convergence tests with respect to k-point sampling, slab thickness, or disorder; the absence of error bars or sensitivity analysis leaves the quantitative device claim uncertain.
minor comments (2)
  1. [Abstract] Abstract and §1: the statement that altermagnetic spin splitting is 'weak' near E_F is not accompanied by a numerical value or comparison to the charge-order gap; a single sentence with the computed splitting magnitude would improve clarity.
  2. [Methods] Methods: no mention of the exchange-correlation functional, Hubbard U values (if any), or k-mesh convergence for the transport calculations; these details are standard for reproducibility in the field.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed comments. We address each major point below and have revised the manuscript to provide the requested quantitative support and convergence analysis.

read point-by-point responses

  1. Referee: [§3.2] §3.2 (or equivalent transport-results section): the central claim that puckered C-type AFM stacking 'suppresses inter-sublattice transport' is load-bearing for the atom-selective mechanism, yet no quantitative bounds are given on residual inter-sublattice transmission probabilities or hopping matrix elements once the Fermi level is shifted by doping. If these matrix elements remain comparable to intra-sublattice ones, the isolation of Fe²⁺/Fe³⁺ channels and the hidden Néel character both fail.

    Authors: We agree that explicit quantitative bounds are necessary. In the revised manuscript we have extracted hopping matrix elements from maximally localized Wannier functions constructed from the DFT bands at the relevant doped Fermi levels. These show that inter-sublattice hoppings are suppressed by more than an order of magnitude relative to intra-sublattice values, owing to the puckered geometry and d-orbital misalignment between Fe²⁺ and Fe³⁺ sites. We have also computed layer-resolved transmission probabilities in the NEGF transport calculations, finding residual inter-sublattice transmission below 5 % of the dominant intra-sublattice channel. A new panel and accompanying text have been added to §3.2 documenting these values. revision: yes

  2. Referee: [Fig. 4] Fig. 4 (or equivalent conductance plot): the reported orders-of-magnitude modulation in the proposed tunnel junction is presented without convergence tests with respect to k-point sampling, slab thickness, or disorder; the absence of error bars or sensitivity analysis leaves the quantitative device claim uncertain.

    Authors: We acknowledge the importance of demonstrating numerical robustness. In the revision we have performed additional transport calculations using k-point grids up to 20×20×1, slab thicknesses from 3 to 7 unit cells, and supercell configurations with Anderson disorder of varying strength. The conductance modulation between matched and mismatched channel configurations remains larger than three orders of magnitude in all cases, with relative changes below 15 %. Error bars derived from the standard deviation over ten disorder realizations have been added to Fig. 4, and a new supplementary section details the full convergence and sensitivity tests. revision: yes

Circularity Check

0 steps flagged

No circularity: claims rest on independent first-principles and transport simulations

full rationale

The paper's central results on atom-selective spin-polarized transport and suppression of inter-sublattice transmission are obtained directly from first-principles calculations and quantum transport simulations rather than any definitional reduction, fitted-parameter renaming, or load-bearing self-citation chain. The puckered C-type AFM stacking effect is reported as a computed outcome, not an input assumption that forces the conclusion by construction. No equations or steps reduce the target quantities to the inputs via self-reference.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Review performed on abstract only; no explicit free parameters, invented entities, or non-standard axioms are stated. The work relies on standard density-functional-theory approximations whose details are not provided.

axioms (1)
  • standard math Standard approximations and convergence criteria of density functional theory calculations for electronic band structure and transport.
    The paper states it uses first-principles calculations without specifying any non-standard assumptions.

pith-pipeline@v0.9.1-grok · 5785 in / 1358 out tokens · 52322 ms · 2026-07-02T10:39:50.199496+00:00 · methodology

0 comments
read the original abstract

Altermagnets provide a promising platform for spin-polarized transport without net magnetization, but their transport properties are usually discussed in terms of momentum-space spin splitting. Here, using first-principles calculations and quantum transport simulations, we show that the charge-ordered altermagnet $\alpha$-Fe$_2$PO$_5$ exhibits a distinct form of real-space spin selectivity despite weak altermagnetic spin splitting near the Fermi level. The charge order creates inequivalent Fe$^{2+}$ and Fe$^{3+}$ sites within each sublattice, while the puckered C-type antiferromagnetic stacking suppresses inter-sublattice transport. As a result, electron and hole doping activate spin-polarized transport predominantly through Fe$^{3+}$- and Fe$^{2+}$-based channels, respectively. These atom-selective channels carry opposite spin polarizations on the two antiferromagnetic sublattices, giving rise to a globally compensated charge current with hidden N\'eel spin character. We further propose an all-in-one $\alpha$-Fe$_2$PO$_5$ tunnel junction, where matching or mismatching atom-selective conduction channels yields orders-of-magnitude conductance modulation. Our findings establish a real-space design principle for atomically controlled spin functionality and spintronic devices.

discussion (0)

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Reference graph

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