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arxiv: 2605.01088 · v1 · submitted 2026-05-01 · ❄️ cond-mat.mtrl-sci

Recognition: unknown

Evidence for altermagnetic order in Cr-doped FeSb2

A K M Ashiquzzaman Shawon, Amir Henderson, Elena Gati, Eoghan Downey, Lu Li, Mingyu Xu, Na Hyun Jo, Rafael Lopes Sabainsk, Shane Smolenski, Thomas J. Hicken, Trisha Musall, Weiwei Xie, Yuan Zhu, Zurab Guguchia

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Pith reviewed 2026-05-09 18:40 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords altermagnetismCr-doped FeSb2anomalous Hall effectmuon spin relaxationcompensated magnetismtime-reversal symmetry breakingmagnetoresistance
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0 comments X

The pith

Cr-doped FeSb2 displays spin-compensated magnetic order with time-reversal symmetry breaking below 3.5 K.

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

The paper synthesizes single crystals of Fe1-xCrxSb2 and focuses on the 15 percent chromium composition. Magnetization measurements show that moments compensate below about 3.5 kelvin while pointing along the b axis. Transport data reveal a crossover in magnetoresistance and the onset of an anomalous Hall signal at the same temperature, pointing to broken time-reversal symmetry. Muon spin relaxation detects the ordering throughout the sample volume rather than in impurity phases. These observations are offered as support for an altermagnetic state in which time-reversal symmetry is broken by the relation between spin sublattices without producing net magnetization.

Core claim

Single-crystal measurements on Fe0.85Cr0.15Sb2 reveal spin-compensated ordering below 3.5 K with moments aligned along the b-direction. An anomalous Hall response emerges at the same temperature while net magnetization remains zero, and muon spin relaxation detects bulk magnetic order. These observations are presented as evidence for an altermagnetic ground state in which time-reversal symmetry is broken by the symmetry relation between spin sublattices rather than by net magnetization.

What carries the argument

The combination of compensated magnetization, anomalous Hall effect, and bulk muon relaxation signal that together indicate time-reversal symmetry breaking without net moment, consistent with altermagnetic symmetry.

Load-bearing premise

The observed compensated ordering, anomalous Hall response, and bulk muon relaxation signal arise specifically from altermagnetic symmetry in the doped crystal structure rather than other compensated magnetic states, impurities, or experimental artifacts.

What would settle it

A direct measurement such as neutron diffraction that finds no magnetic Bragg peaks, or transport data on cleaner crystals that show no anomalous Hall effect, would indicate that the ordering is not altermagnetic.

Figures

Figures reproduced from arXiv: 2605.01088 by A K M Ashiquzzaman Shawon, Amir Henderson, Elena Gati, Eoghan Downey, Lu Li, Mingyu Xu, Na Hyun Jo, Rafael Lopes Sabainsk, Shane Smolenski, Thomas J. Hicken, Trisha Musall, Weiwei Xie, Yuan Zhu, Zurab Guguchia.

Figure 1
Figure 1. Figure 1: FIG. 1. (A) Crystal structure of orthorhombic Fe view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Electrical and magnetic properties in the Fe view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (A) Weak transverse field (TF) muon spectra reveal asymmetry at 7.5 K and below. (B) Magnetic volume fraction, view at source ↗
read the original abstract

Altermagnets are a class of materials with compensated magnetic moments, in which spin sublattices are related by specific symmetries other than inversion or translation. This allows time-reversal symmetry to be broken without a net magnetization. Here, we synthesize single crystals of Fe1-xCrxSb2 and investigate their electrical transport and magnetic properties, with a focus on Fe0.85Cr0.15Sb2. Magnetization measurements suggest spin-compensated ordering below ~ 3.5 K, where magnetic moments align along the crystallographic b-direction. Transport measurements reveal a crossover from large positive to negative magnetoresistance, while an anomalous Hall response emerges below 3.5 K, indicating time-reversal symmetry breaking below TN. Muon spin relaxation measurements demonstrate bulk magnetic order below 3.5 K, confirming that the low temperature ordering is intrinsic rather than due to an impurity phase. These results support a potential altermagnetic ground state in Cr-doped FeSb2 with time-reversal symmetry breaking without net magnetization.

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 / 2 minor

Summary. The manuscript reports synthesis of single crystals of Fe1-xCrxSb2 (focus on x=0.15) and presents magnetization data showing spin-compensated ordering below ~3.5 K with moments along the b-axis, a crossover from positive to negative magnetoresistance, emergence of anomalous Hall effect below TN indicating TRS breaking, and muon spin relaxation confirming intrinsic bulk magnetic order. These observations are interpreted as supporting a potential altermagnetic ground state with compensated moments and TRS breaking without net magnetization.

Significance. If substantiated, this would add a doped narrow-gap semiconductor to the altermagnet family, providing a platform for studying altermagnetism in correlated systems. The multi-probe experimental approach, particularly the bulk-sensitive muSR ruling out impurity phases, strengthens evidence for compensated TRS breaking. This is a solid experimental contribution even if further symmetry confirmation is needed.

major comments (2)
  1. [Discussion and conclusions] The central claim that the data establish altermagnetic order specifically (rather than other compensated magnetic states) is not fully supported. The combination of compensated magnetization along b, AHE below 3.5 K, and bulk muSR signal is consistent with altermagnetism but also with conventional antiferromagnetism or canted orders allowed by the same observables. The manuscript lacks neutron diffraction for magnetic structure refinement or magnetic space-group determination to confirm spin-sublattice symmetries (e.g., rotations relating opposite-spin sites) required by the altermagnetic definition. This is load-bearing for the interpretation in the abstract and conclusions.
  2. [Muon spin relaxation results] Quantitative details on muSR fitting (relaxation rates, internal field distributions) and comparison to expected altermagnetic signatures are insufficient to exclude alternative models. The abstract notes bulk order but does not provide raw asymmetry spectra, error bars, or model comparisons that would strengthen the claim.
minor comments (2)
  1. [Abstract] The abstract would benefit from specifying the magnitude of the MR crossover, exact field/temperature ranges, and numerical values for the anomalous Hall resistivity to allow better assessment of the transport data strength.
  2. [Methods and experimental details] Include more details on crystal quality, doping homogeneity (e.g., via EDX mapping), and how the 3.5 K transition temperature was determined with uncertainties for reproducibility.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for their positive assessment of the work's significance and for the constructive comments. We address each major point below and have revised the manuscript where feasible to strengthen the presentation without overstating the conclusions.

read point-by-point responses

  1. Referee: [Discussion and conclusions] The central claim that the data establish altermagnetic order specifically (rather than other compensated magnetic states) is not fully supported. The combination of compensated magnetization along b, AHE below 3.5 K, and bulk muSR signal is consistent with altermagnetism but also with conventional antiferromagnetism or canted orders allowed by the same observables. The manuscript lacks neutron diffraction for magnetic structure refinement or magnetic space-group determination to confirm spin-sublattice symmetries (e.g., rotations relating opposite-spin sites) required by the altermagnetic definition. This is load-bearing for the interpretation in the abstract and conclusions.

    Authors: We agree that neutron diffraction would provide the most direct confirmation of the spin-sublattice symmetries that distinguish altermagnetism from other compensated states. Our multi-probe data set (compensated magnetization along b, emergence of AHE indicating TRS breaking without net moment, and bulk muSR) is consistent with altermagnetism but does not uniquely exclude all conventional AFM or canted alternatives permitted by the observables alone. We have revised the abstract and conclusions to emphasize that the results support a potential altermagnetic ground state rather than claiming to establish altermagnetic order. We have also expanded the discussion section to explain why the orthorhombic symmetry of Fe1-xCrxSb2 and the specific combination of AHE with zero net magnetization make simple canted or conventional AFM orders less likely, while acknowledging that definitive symmetry confirmation requires neutron diffraction. revision: partial

  2. Referee: [Muon spin relaxation results] Quantitative details on muSR fitting (relaxation rates, internal field distributions) and comparison to expected altermagnetic signatures are insufficient to exclude alternative models. The abstract notes bulk order but does not provide raw asymmetry spectra, error bars, or model comparisons that would strengthen the claim.

    Authors: We thank the referee for highlighting the need for more detailed muSR presentation. In the revised manuscript we have added the raw asymmetry spectra (with error bars) as a supplementary figure, included quantitative fitting parameters (relaxation rates, internal field distributions), and provided explicit comparisons to model expectations for altermagnetic order versus impurity or alternative scenarios. These additions clarify how the muSR data support intrinsic bulk order and help constrain alternative models. revision: yes

standing simulated objections not resolved
  • We do not have neutron diffraction data on the Fe0.85Cr0.15Sb2 crystals, which would be required for magnetic structure refinement and definitive confirmation of the spin-sublattice symmetries.

Circularity Check

0 steps flagged

No circularity: purely experimental interpretation against standard definition

full rationale

The paper reports synthesis of Fe1-xCrxSb2 crystals and presents direct experimental data from magnetization, magnetotransport, and muon spin relaxation measurements. It defines altermagnetism in the abstract and concludes that the observed compensated order, anomalous Hall effect, and bulk μSR signal are consistent with a potential altermagnetic state. No equations, derivations, fitted parameters, or theoretical models are introduced that could create self-referential steps. The central claim is an interpretation of measurements against an external definition of altermagnetism, with no reduction of any result to its own inputs by construction. This is a standard experimental paper whose reasoning chain is self-contained and non-circular.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on experimental data being consistent with the definition of altermagnetism. No free parameters are introduced or fitted in the abstract. The key axiom is the standard definition of altermagnets from prior literature.

axioms (1)
  • domain assumption Altermagnets are materials with compensated magnetic moments in which spin sublattices are related by specific symmetries other than inversion or translation, allowing time-reversal symmetry breaking without net magnetization.
    This definition is invoked in the abstract to interpret the observed ordering, anomalous Hall effect, and muSR signal as altermagnetic.

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discussion (0)

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Reference graph

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