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arxiv: 2606.29813 · v1 · pith:BRRZDDAMnew · submitted 2026-06-29 · ❄️ cond-mat.mtrl-sci

Field-induced topological Hall effect and butterfly-shaped magnetoresistance in the centrosymmetric antiferromagnet EuAuAs

Yu Zhang , Junfa Lin , Huan Wang , Kun Han , Yiting Wang , Xue Dong , Zhenfeng Guan , Shengdi Xi
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Tian-Long Xia
This is my paper

Pith reviewed 2026-06-30 05:33 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords topological Hall effectantiferromagnetEuAuAsscalar spin chiralitymagnetoresistancemetamagnetic transitionmagnetic domains
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0 comments X

The pith

In EuAuAs a topological Hall effect appears in the antiferromagnetic state when the field lies in the ab plane and current flows along c.

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

The paper measures the magnetic and electrical transport properties of the centrosymmetric antiferromagnet EuAuAs. It reports antiferromagnetic ordering near 6 K together with metamagnetic transitions when the field is applied in the ab plane. A clear topological Hall resistivity is observed under the specific orientation H parallel to ab and I parallel to c, interpreted as arising from field-induced scalar spin chirality. The magnetoresistance displays butterfly-shaped hysteresis loops whose angular dependence is attributed to spin-dependent scattering and domain-wall pinning. These observations indicate that field-induced magnetic textures control the electronic transport response in this material.

Core claim

Electrical transport measurements reveal a pronounced topological Hall effect in the antiferromagnetic state with H ∥ ab and I ∥ c, which may be attributed to finite scalar spin chirality. Furthermore, the magnetoresistance exhibits butterfly-shaped hysteresis and strong angular dependence, which are likely associated with spin-dependent electron scattering, magnetic-domain evolution, and domain-wall pinning.

What carries the argument

Field-induced finite scalar spin chirality that produces a real-space Berry phase and thereby a topological contribution to the Hall resistivity.

If this is right

  • Field-induced spin textures dominate magnetotransport in this centrosymmetric antiferromagnet.
  • The observed metamagnetic transition correlates with the onset of the topological Hall signal.
  • Butterfly-shaped magnetoresistance hysteresis tracks the evolution and pinning of magnetic domains.
  • Angular dependence of both Hall and magnetoresistance signals reflects the underlying magnetic anisotropy.

Where Pith is reading between the lines

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

  • Centrosymmetric antiferromagnets without built-in Dzyaloshinskii-Moriya interaction can still generate topological Hall signals once an external field creates non-coplanar spin arrangements.
  • The same field-induced chirality mechanism may operate in other layered europium-based antiferromagnets with similar crystal symmetry.
  • Systematic variation of current and field directions could map out the full angular landscape of the topological Hall response.

Load-bearing premise

The extra Hall resistivity component is produced by scalar spin chirality rather than by ordinary Hall, anomalous Hall, or measurement artifacts.

What would settle it

Subtracting the ordinary and anomalous Hall contributions from the measured Hall resistivity leaves no residual signal, or neutron diffraction shows only collinear spins with no non-coplanar textures under the same field conditions.

Figures

Figures reproduced from arXiv: 2606.29813 by Huan Wang, Junfa Lin, Kun Han, Shengdi Xi, Tian-Long Xia, Xue Dong, Yiting Wang, Yu Zhang, Zhenfeng Guan.

Figure 1
Figure 1. Figure 1: FIG. 1. Crystal structure and longitudinal resistivity of EuAuAs. (a) [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Magnetic properties of EuAuAs single crystal. (a) The temperature dependent magnetic susceptibility at zero-field cooled (ZFC) and [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. THE in EuAuAs. (a) Magnetic-field dependent Hall resistivity [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. The magnetoresistance measurement of EuAuAs. (a) Magnetoresistance [MR = [ [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
read the original abstract

The coupling between magnetic and electronic degrees of freedom gives rise to a variety of intriguing transport phenomena. Among them, the topological Hall effect, originating from the real-space Berry phase associated with nontrivial magnetic textures, has attracted considerable attention. Here, we systematically investigate the magnetic and transport properties of antiferromagnet EuAuAs. Magnetic characterizations reveal antiferromagnetic transition at 5.7 K and 6.3 K for $H \parallel ab$ and $H \parallel c$, accompanied by metamagnetic transition and small hysteresis for $H \parallel ab$. Electrical transport measurements reveal a pronounced topological Hall effct in the antiferromagnetic state with $H \parallel ab$ and $I \parallel c$, which may be attributed to finite scalar spin chirality. Furthermore, the magnetoresistance exhibits butterfly-shaped hysteresis and strong angular dependence, which are likely associated with spin-dependent electron scattering, magnetic-domain evolution, and domain-wall pinning. Our results suggest that field-induced spin textures play an important role in the magnetotransport properties and provide insights into the interplay between magnetic textures and electronic transport in centrosymmetric antiferromagnets.

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 magnetic and transport properties of the centrosymmetric antiferromagnet EuAuAs. Magnetic data show AFM transitions at 5.7 K (H ∥ ab) and 6.3 K (H ∥ c), with metamagnetic transitions and small hysteresis for H ∥ ab. Transport measurements identify a pronounced topological Hall effect in the AFM state for H ∥ ab and I ∥ c, interpreted as arising from finite scalar spin chirality; magnetoresistance displays butterfly-shaped hysteresis with strong angular dependence, attributed to spin-dependent scattering, domain evolution, and domain-wall pinning. The work concludes that field-induced spin textures are important for magnetotransport in this system.

Significance. Confirmation of a field-induced topological Hall effect arising from scalar spin chirality in a centrosymmetric antiferromagnet would be of interest for understanding real-space Berry phase effects in systems lacking Dzyaloshinskii-Moriya interaction. The angular-dependent magnetoresistance data provide additional experimental constraints on domain-related scattering mechanisms.

major comments (2)
  1. [Electrical transport measurements (results and discussion sections)] The central interpretation that the observed Hall signal is topological and due to finite scalar spin chirality requires an explicit subtraction protocol (ordinary Hall linear in H plus any anomalous Hall from canted Eu moments) that demonstrably does not absorb the putative topological term. No such equations or step-by-step procedure are provided, leaving open the possibility that the residual is conventional or artifactual.
  2. [Discussion of topological Hall effect] Independent verification of the proposed non-coplanar spin texture (required for nonzero scalar spin chirality) at the fields and temperatures where the Hall signal appears is absent; neither neutron diffraction nor Berry-curvature calculations are presented to support the attribution beyond the transport data alone.
minor comments (2)
  1. [Abstract] Abstract contains a typo: 'effct' should read 'effect'.
  2. [Figure captions] Figure labels and captions should explicitly state the current and field directions (H ∥ ab, I ∥ c) for each panel to improve clarity of the angular-dependence data.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments. We address the major comments point by point below.

read point-by-point responses

  1. Referee: [Electrical transport measurements (results and discussion sections)] The central interpretation that the observed Hall signal is topological and due to finite scalar spin chirality requires an explicit subtraction protocol (ordinary Hall linear in H plus any anomalous Hall from canted Eu moments) that demonstrably does not absorb the putative topological term. No such equations or step-by-step procedure are provided, leaving open the possibility that the residual is conventional or artifactual.

    Authors: We agree that an explicit subtraction protocol is necessary. In the revised manuscript we will add a detailed description of the procedure, including the decomposition ρ_xy = ρ_xy^O + ρ_xy^A + ρ_xy^T, the method used to determine the ordinary (linear-in-H) and anomalous contributions, and explicit demonstration that the residual Hall resistivity cannot be absorbed by adjustments to the conventional terms. revision: yes

  2. Referee: [Discussion of topological Hall effect] Independent verification of the proposed non-coplanar spin texture (required for nonzero scalar spin chirality) at the fields and temperatures where the Hall signal appears is absent; neither neutron diffraction nor Berry-curvature calculations are presented to support the attribution beyond the transport data alone.

    Authors: The manuscript does not contain neutron diffraction data or Berry-curvature calculations. The attribution rests on the observed field and temperature dependence of the Hall signal coinciding with the metamagnetic transition in the AFM state. We will revise the discussion to state this basis more explicitly and to note the absence of direct structural or computational confirmation as a limitation of the present transport-focused study. revision: no

Circularity Check

0 steps flagged

No circularity: purely experimental report with no derivations or self-referential claims

full rationale

The manuscript presents magnetic and electrical transport measurements on EuAuAs, reporting transitions, hysteresis, and a Hall signal interpreted as possibly topological. No equations, derivations, fitted parameters renamed as predictions, or load-bearing self-citations appear in the provided text or abstract. The attribution to scalar spin chirality is stated as a possible interpretation ('may be attributed') rather than a result derived from any internal chain. This is a standard experimental paper whose central claims rest on data rather than any reduction to inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

Abstract-only review; ledger is minimal and based solely on stated background facts.

axioms (1)
  • domain assumption EuAuAs undergoes antiferromagnetic transitions at 5.7 K (H ∥ ab) and 6.3 K (H ∥ c) with accompanying metamagnetic transitions.
    Stated directly in the abstract as the magnetic context for the transport measurements.
invented entities (1)
  • finite scalar spin chirality no independent evidence
    purpose: Proposed origin of the observed topological Hall effect via real-space Berry phase.
    Introduced in the abstract as a possible attribution without independent verification or falsifiable prediction shown.

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Reference graph

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