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arxiv: 2605.07904 · v1 · submitted 2026-05-08 · ❄️ cond-mat.mtrl-sci

Recognition: no theorem link

Anomalous magnetotransport in a non-collinear correlated kagome ferromagnet MgMn6Sn6

Chandra Shekhar, Jhuma Sannigrahi, Jyotirmoy Sau, Kakan Deb, Manoranjan Kumar, Matthias Gutmann, Nitesh Kumar, Sourav Kanthal

Pith reviewed 2026-05-11 03:23 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords kagome ferromagnetanomalous Hall conductivitynon-collinear magnetismmagnetotransportelectron correlationMgMn6Sn6intrinsic anomalous Hall effect
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The pith

MgMn6Sn6 shows a large intrinsic anomalous Hall conductivity of 0.29 e²/h per kagome layer that stays nearly constant with field direction.

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

The paper establishes that MgMn6Sn6, a room-temperature kagome ferromagnet, hosts a non-collinear arrangement of Mn moments in the basal plane. This structure produces an anomalous Hall conductivity with a dominant intrinsic component of roughly 0.29 e²/h per layer that remains nearly isotropic regardless of magnetic field orientation. At low temperatures an additional anisotropic extrinsic term appears, tied to directional scattering. The material also exhibits a large Sommerfeld coefficient without f-electrons, taken as evidence of enhanced electron correlations. Together these findings position the compound as a platform for examining how non-collinear magnetism and correlations shape magnetotransport.

Core claim

Single-crystal neutron diffraction reveals a non-collinear in-plane arrangement of Mn moments within the kagome bilayer. Magnetotransport measurements combined with first-principles calculations then show that the anomalous Hall conductivity contains a substantial intrinsic contribution of approximately 0.29 e²/h per kagome layer that is nearly isotropic with respect to field orientation. At low temperatures this conductivity acquires a pronounced anisotropic extrinsic component. The large Sommerfeld coefficient, observed in the absence of f-electrons, is interpreted as a signature of enhanced electron correlation driven by the non-collinear magnetic order.

What carries the argument

The non-collinear arrangement of Mn magnetic moments within the basal plane of the kagome bilayer, which generates a substantial Berry-curvature-driven intrinsic anomalous Hall conductivity while also modulating low-temperature scattering.

Load-bearing premise

That the large Sommerfeld coefficient directly signals enhanced electron correlation caused by the absence of f-electrons and that the non-collinear magnetic structure is the main driver of the observed magnetotransport features.

What would settle it

Neutron diffraction data showing collinear rather than non-collinear Mn moments, or first-principles Berry-curvature calculations yielding an intrinsic Hall conductivity far below 0.29 e²/h per layer, would falsify the claimed intrinsic contribution and its link to the magnetic structure.

Figures

Figures reproduced from arXiv: 2605.07904 by Chandra Shekhar, Jhuma Sannigrahi, Jyotirmoy Sau, Kakan Deb, Manoranjan Kumar, Matthias Gutmann, Nitesh Kumar, Sourav Kanthal.

Figure 1
Figure 1. Figure 1: a, Powder XRD pattern of MgMn6Sn6 along with the Rietveld refinement. b, Crystal structure of MgMn6Sn6 viewed from the side and top. c, In-plane and out-of-plane X-ray diffraction patterns of MgMn6Sn6 single crystals. The right insets show photographs of typical single crystals, while the bottom-left inset shows a Laue diffraction photograph taken along the [0001] direction of an aligned sample. d, Schemat… view at source ↗
Figure 2
Figure 2. Figure 2: a, Magnetization measured under an external mag￾netic field B = 50 Oe applied along the x and z directions, following the FCW protocol. b, c, Magnetization as a func￾tion of magnetic field, with B ∥ x (b) and B ∥ z (c), recorded at selected temperatures between 2-350 K. d, Temperature dependence of the magnetic anisotropy energy density KU . The inset shows the M-B curves measured at 2 K, and the shaded re… view at source ↗
Figure 3
Figure 3. Figure 3: a, b, Integrated intensity maps in the (h 0 l) layer of MgMn6Sn6 measured on SXD at 380 K (a) and 5 K (b). The red circles indicate peaks with a clear change in intensity with temperature. c, Integrated intensity of the magnetic (0 0 4) peak from 380 K down to 5 K, with the Mn ordered moment derived from neutron refinement shown on the right axis. e, f, Plots of calculated vs. experimental magnetic structu… view at source ↗
Figure 4
Figure 4. Figure 4: a, Electrical resistivity as a function of temperature for current applied along the x direction and the inset shows the fitting of the resistivity curve at low temperatures. b, c, Magnetoresistance vs. B at selected temperatures, measured with the magnetic field along the y (b) and z (c) directions, respectively. The insets show enlarged views of the low-field region for both field orientations. MR. Above… view at source ↗
Figure 5
Figure 5. Figure 5: a, b, Hall resistivity ρzx (a) and ρyx (b) as a function of magnetic field B at selected temperatures. The insets show the corresponding resistivity plots at low temperatures for clarity, and the dashed lines in the inset of b represent the linear fit to ρ N yx. c, d, Temperature dependence of the anomalous Hall resistivity and anomalous Hall conductivity for B ∥ y (c) and B ∥ z (d). e, f, ρ A jiMs(2 K)/Ms… view at source ↗
Figure 6
Figure 6. Figure 6: a, b, Temperature dependence of the normal Hall coefficient R0 (a) and the corresponding carrier density n (b) for B ∥ y. c, d, Anomalous Hall coefficient Rs plotted as a function of temperature for B ∥ y (c) and B ∥ z (d). The top-left insets in c and d show the corresponding tempera￾ture dependence of the anomalous Hall scaling factor. The bottom-right inset in d highlights Rs in the low-temperature regi… view at source ↗
Figure 7
Figure 7. Figure 7: a, Calculated electronic band structure of MgMn6Sn6 with SOC along the high-symmetry path M–K–Γ–K–M. The horizontal black dashed line indicates a downward shift of EF by ∼ 20 meV used to reproduce the experimental AHC value. Inset: First BZ of MgMn6Sn6 with the high-symmetry points marked. b, Berry curvature distri￾bution in the kz = 0 plane. whereas Sn states contribute negligibly to the net mag￾netizatio… view at source ↗
Figure 8
Figure 8. Figure 8: a, Specific heat Cp(T) as a function of temperature for a MgMn6Sn6 single crystal. Inset: Cp/T versus T 2 ; the solid red line represents the linear fit to the data in the tem￾perature range 2-5 K. the out-of-plane Mn dz 2 orbital. Another notable feature is the touching of a nearly flat band with a quadratic dis￾persive band at the Γ-point in the absence of SOC (see SI, Fig. S5b). The inclusion of SOC ope… view at source ↗
read the original abstract

Magnetic kagome metals provide a fertile platform for exploring unusual magnetotransport phenomena arising from the intricate interplay between electronic topology, electron correlations, and magnetic order. MgMn6Sn6 is a room-temperature kagome ferromagnet with strong in-plane magnetic anisotropy. Here, we report a combined study of single-crystal neutron diffraction (SCND) and magnetotransport properties of MgMn6Sn6, supported by first-principles calculations. Our SCND measurements reveal a non-collinear arrangement of Mn magnetic moments within the basal plane of the kagome bilayer. The Hall conductivity shows a substantial intrinsic contribution of approximately 0.29 e^2/h per kagome layer, which is nearly isotropic with respect to the field orientation. At low temperatures, the anomalous Hall conductivity develops a pronounced anisotropic extrinsic component, highlighting the directional sensitivity of scattering processes. The significantly large value of the Sommerfeld coefficient, in the absence of f-electrons, underscores enhanced electron correlation. Therefore, the non-collinear kagome ferromagnet MgMn6Sn6 is a promising candidate for studying the effects of electron correlation on magnetotransport properties.

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

0 major / 3 minor

Summary. The manuscript reports single-crystal neutron diffraction (SCND) measurements on MgMn6Sn6 revealing a non-collinear arrangement of Mn moments within the kagome bilayer basal plane. Combined with magnetotransport data and first-principles calculations, it identifies a substantial intrinsic anomalous Hall conductivity of approximately 0.29 e²/h per kagome layer that is nearly isotropic with field orientation, an anisotropic extrinsic component that emerges at low temperatures, and a large Sommerfeld coefficient interpreted as evidence of enhanced electron correlations in the absence of f-electrons.

Significance. If the central claims hold, the work adds a well-characterized example of Berry-phase-driven anomalous Hall effect in a non-collinear kagome ferromagnet, with the reported intrinsic value and its isotropy providing a concrete benchmark. The explicit use of SCND to establish the magnetic structure, standard separation of intrinsic versus extrinsic Hall contributions, and supporting calculations constitute a strength; the Sommerfeld-coefficient discussion is supplementary and does not underpin the magnetotransport results.

minor comments (3)
  1. [Abstract] The abstract states numerical values for the Hall conductivity and Sommerfeld coefficient without error bars or fitting details; the full manuscript should ensure these uncertainties, raw data, and analysis procedures are clearly presented in the results and methods sections.
  2. The normalization of the Hall conductivity per kagome layer is central to the isotropy claim; a brief explicit statement of the layer thickness or unit-cell volume used for this conversion would improve clarity.
  3. Figure captions and text should consistently distinguish the temperature regimes where the extrinsic anisotropic component dominates from the higher-temperature isotropic intrinsic regime.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the positive overall assessment. The recommendation for minor revision is noted. No specific major comments were provided in the report, so we have no point-by-point responses to address. We will incorporate minor improvements to the manuscript in the revised version.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper's claims rest on experimental SCND data for the non-collinear Mn structure, direct magnetotransport measurements yielding the Hall conductivity values, and standard first-principles Berry curvature computations to separate intrinsic (~0.29 e²/h per layer) and extrinsic contributions. No equations, fits, or predictions reduce by construction to the paper's own inputs or self-citations; the Sommerfeld coefficient discussion is supplementary and does not drive the magnetotransport results. The derivation chain is self-contained against external benchmarks with no load-bearing self-referential steps.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Claims rest on standard neutron diffraction interpretation, conventional anomalous Hall conductivity decomposition into intrinsic/extrinsic parts, and standard DFT band-structure methods; no new free parameters, ad-hoc axioms, or invented entities are introduced.

axioms (2)
  • domain assumption Standard decomposition of anomalous Hall conductivity into intrinsic (Berry curvature) and extrinsic (scattering) contributions
    Invoked when separating the isotropic intrinsic part from the low-T anisotropic extrinsic part.
  • domain assumption Large Sommerfeld coefficient indicates enhanced electron correlations in the absence of f-electrons
    Used to link the measured value to correlation effects.

pith-pipeline@v0.9.0 · 5539 in / 1362 out tokens · 43808 ms · 2026-05-11T03:23:47.690836+00:00 · methodology

discussion (0)

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Reference graph

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