Pith. sign in

REVIEW 2 major objections 1 minor 41 references

The anomalous Nernst conductivity magnitude is set by the sum of the anomalous Nernst and Hall angles, so aligning their signs increases the effect.

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2026-07-02 10:43 UTC pith:MQFYIOGD

load-bearing objection The paper links ANC magnitude to the algebraic sum of anomalous Nernst and Hall angles and shows Fe doping in Co3Sn2S2 can align their signs to increase the effect, plus a consistent TlnT scaling. the 2 major comments →

arxiv 2607.00401 v1 pith:MQFYIOGD submitted 2026-07-01 cond-mat.mtrl-sci

Modulation of the Nernst Thermoelectrics by Regulating the Anomalous Hall and Nernst Angles

Meng Lyu , Junyan Liu , Jianlei Shen , Shen Zhang , Yang Liu , Jinying Yang , Yibo Wang , Yiting Feng
show 3 more authors
Binbin Wang Hongxiang Wei Enke Liu
This is my paper
classification cond-mat.mtrl-sci
keywords anomalous Nernst effectanomalous Hall angleNernst thermoelectricsCo3Sn2S2magnetic Weyl semimetalsangle regulationtopological materialsthermoelectric optimization
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.

This paper establishes that the anomalous Nernst conductivity in magnetic Weyl semimetals scales directly with the sum of the anomalous Nernst angle and the anomalous Hall angle. The Hall angle sign tends to remain fixed in a given material while the Nernst angle sign can be changed internally. Aligning the two angles therefore raises the conductivity, and iron doping of Co3Sn2S2 demonstrates the modulation experimentally. A consistent T ln T temperature dependence across samples supports an intrinsic mechanism. The approach supplies a direct route to stronger Nernst thermoelectrics in materials that normally show opposing angle signs.

Core claim

The magnitude of the anomalous Nernst conductivity is directly related to the sum of the anomalous Nernst and Hall angles. While the sign of the anomalous Hall angle is relatively stable, the sign of the anomalous Nernst angle can be intrinsically tuned. The conductivity can therefore be optimized by regulating the angles to work in concert. This relation is verified by experimental modulation in iron-doped Co3Sn2S2. A robust T ln T scaling law of the conductivity holds from 40 to 140 K in all samples, indicating an intrinsic origin. The common occurrence of opposite angle signs in magnetic topological materials can thus be overcome.

What carries the argument

Direct dependence of anomalous Nernst conductivity on the sum of the anomalous Nernst and Hall angles, which permits optimization by aligning their signs.

Load-bearing premise

The sign of the anomalous Nernst angle can be tuned independently of the anomalous Hall angle while preserving the material's topological character.

What would settle it

If measurements on iron-doped Co3Sn2S2 samples show that the anomalous Nernst conductivity does not increase when the two angles are aligned to the same sign, the claimed direct sum relation would be contradicted.

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

If this is right

  • Aligning the signs of the anomalous Nernst and Hall angles increases the magnitude of the anomalous Nernst conductivity.
  • Iron doping in Co3Sn2S2 modulates the angles to work in concert while keeping the topological character intact.
  • The T ln T scaling law persists across all studied samples, confirming an intrinsic source of the conductivity.
  • Materials that normally exhibit opposite angle signs become candidates for improved Nernst thermoelectrics through this regulation.

Where Pith is reading between the lines

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

  • The same sign-alignment principle could be tested in other magnetic topological compounds to identify additional tunable systems.
  • Device-level design rules might prioritize dopants that selectively flip the Nernst angle sign without altering the Hall angle sign.
  • If the scaling law extends to higher temperatures, the method could inform room-temperature Nernst thermoelectric prototypes.

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 / 1 minor

Summary. The manuscript claims that the magnitude of the anomalous Nernst conductivity (ANC) is directly related to the sum of the anomalous Nernst and Hall angles in magnetic Weyl semimetals. The sign of the anomalous Nernst angle can be intrinsically tuned (e.g., via Fe doping in Co3Sn2S2) while the Hall angle sign is stable, allowing optimization when the angles work in concert; this is verified experimentally, and a robust T ln T scaling of ANC is observed from 40-140 K across samples, indicating an intrinsic origin. The work proposes this as a general scheme for Nernst thermoelectrics given the common opposite signs of the angles.

Significance. If the angle-sum relation and independent tuning hold without topology changes, the result supplies a concrete, experimentally accessible optimization route for anomalous Nernst thermoelectrics in topological magnets, addressing a practical limitation in the field.

major comments (2)
  1. [Abstract] Abstract: the central relation that ANC magnitude is 'directly related' to the sum of the angles is stated without an explicit formula, derivation from the transport tensors, or reference to a specific equation; this relation is load-bearing for the optimization claim and must be derived or shown in the main text (e.g., from the definitions of the angles and ANC).
  2. [Abstract] Abstract (experimental modulation paragraph): the claim that Fe doping tunes the Nernst angle sign independently while preserving the Hall angle sign and topological character (Weyl nodes, Berry curvature) is load-bearing for attributing ANC enhancement to angle regulation rather than Fermi-level shift or scattering changes; the manuscript must supply explicit checks (e.g., Hall resistivity sign stability, ARPES or calculated band structure confirming unchanged node positions) to rule out alternative explanations.
minor comments (1)
  1. The T ln T scaling is presented as evidence of intrinsic origin, but the temperature window (40-140 K) and any deviation outside it should be shown in a figure with error bars for all doping levels.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments that help strengthen the manuscript. We address each major comment point by point below and will revise the manuscript to improve clarity and rigor.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central relation that ANC magnitude is 'directly related' to the sum of the angles is stated without an explicit formula, derivation from the transport tensors, or reference to a specific equation; this relation is load-bearing for the optimization claim and must be derived or shown in the main text (e.g., from the definitions of the angles and ANC).

    Authors: We agree that an explicit derivation is needed for the central relation. In the revised manuscript we will add a derivation of the ANC magnitude in terms of the sum of the anomalous Nernst and Hall angles, starting from the definitions of the angles and the conductivity tensors, and we will reference the resulting equation from the main text in the abstract. revision: yes

  2. Referee: [Abstract] Abstract (experimental modulation paragraph): the claim that Fe doping tunes the Nernst angle sign independently while preserving the Hall angle sign and topological character (Weyl nodes, Berry curvature) is load-bearing for attributing ANC enhancement to angle regulation rather than Fermi-level shift or scattering changes; the manuscript must supply explicit checks (e.g., Hall resistivity sign stability, ARPES or calculated band structure confirming unchanged node positions) to rule out alternative explanations.

    Authors: We agree that explicit checks are required. Our existing transport data already demonstrate that the Hall resistivity sign remains unchanged across the Fe-doping series; we will present this more prominently. We will also add DFT calculations showing that the Weyl node positions and associated Berry curvature are preserved upon doping, thereby supporting that the topological character is maintained. These additions will be included in the revised manuscript. revision: yes

Circularity Check

0 steps flagged

No significant circularity detected; central relation grounded in experiment

full rationale

The abstract presents the key relation (ANC magnitude directly tied to sum of anomalous Nernst and Hall angles) as a revealed finding, with sign tuning of the Nernst angle described as intrinsic and verified through independent experimental modulation in Fe-doped Co3Sn2S2 samples. A separate TlnT scaling observation is reported across samples as supporting intrinsic origin. No equations, fitted parameters, or self-citations are exhibited in the provided text that reduce this relation or the optimization scheme to a definitional tautology or input by construction. The experimental verification supplies external grounding, rendering the derivation self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only review yields no explicit free parameters, invented entities, or non-standard axioms; the claim rests on standard condensed-matter assumptions about anomalous transport.

axioms (1)
  • domain assumption Standard assumptions of linear response theory and Berry-phase contributions to anomalous Hall and Nernst effects in magnetic topological materials
    Implicit in any discussion of anomalous Nernst conductivity in Weyl semimetals.

pith-pipeline@v0.9.1-grok · 5773 in / 1193 out tokens · 48123 ms · 2026-07-02T10:43:49.176199+00:00 · methodology

0 comments
read the original abstract

The large anomalous Nernst effect in magnetic Weyl semimetals is one of the most intriguing transport phenomena, which draws significant attention for its potential applications in topological thermoelectrics. Despite frequent reports of substantial anomalous Nernst conductivity (ANC), methods to optimize Nernst thermoelectrics remain limited. Our research reveals that the magnitude of the ANC is directly related to the sum of the anomalous Nernst and Hall angles. While the sign of the anomalous Hall angle is relatively stable in a certain material, the sign of the anomalous Nernst angle can be intrinsically tuned. Therefore, the ANC can be effectively optimized by regulating these angles to work in concert. This finding is verified by experimental modulation from iron-doped magnetic topological material Co3Sn2S2. Additionally, we observed a robust TlnT scaling law of the ANC over the temperature range of 40 to 140 K in all studied samples, suggesting an intrinsic origin of the ANC. Considering the common opposite sign of the anomalous Nernst and Hall angles in many magnetic topological materials, our research offers an applicable scheme for optimizing the Nernst thermoelectrics.

Figures

Figures reproduced from arXiv: 2607.00401 by Binbin Wang, Enke Liu, Hongxiang Wei, Jianlei Shen, Jinying Yang, Junyan Liu, Meng Lyu, Shen Zhang, Yang Liu, Yibo Wang, Yiting Feng.

Figure 1
Figure 1. Figure 1: Crystal structure and transport properties of Co3-xFexSn2S2. a) Crystal structure of Co3Sn2S2 with quasi-2D Co3Sn layers, where the Co atoms form a kagome lattice and the doped Fe atoms replace some of the Co atoms. b) Schematic configuration of thermoelectric measurements, where the heat current from a resistance chip heater generates the temperature gradient ∇𝑥𝑇, the longitudinal Seebeck voltage Vxx and … view at source ↗
Figure 2
Figure 2. Figure 2: Anomalous Nernst conductivity of Co3-xFexSn2S2. a) The anomalous Nernst conductivity 𝛼𝑦𝑥 A was calculated from the measured ρxx, ρyx A, Sxx, and Syx A . It also shows the data of pristine Co3Sn2S2 from Ref. [8], which is consistent with our crystal. The inset illustrates the maximum ANC at varying Fe contents. One can immediately see that 𝛼𝑦𝑥 A is largely enhanced as the Fe content increases to 0.15. b), c… view at source ↗
Figure 4
Figure 4. Figure 4: Detailed terms of the ANC in Co3-xFexSn2S2. a), b) The temperature dependent longitudinal Peltier conductivity 𝛼𝑥𝑥 and the sum of tan 𝜃𝑁 A and tan 𝜃𝐻 A, the total ANC being the multiplication by these two terms. The inset shows the variation of (tan 𝜃𝐻 A + tan 𝜃𝑁 A ) with different Fe content at the selected temperature T = 10, 50, 80 K. c), d) The temperature dependent tan 𝜃𝐻 A and tan 𝜃𝑁 A . The sign of … view at source ↗
Figure 5
Figure 5. Figure 5: The upper panel shows the maximum ANC for the reported magnetic topological system. The lower panel displays the corresponding tan 𝜃𝐻 A and tan 𝜃𝑁 A. The data in the green shadow indicates a significant amplification of the ANC (at T = 80 K) for Co3-xFexSn2S2 when tuning tan 𝜃𝐻 A and tan 𝜃𝑁 A to the same sign. YbMnBi2 的 Bi 写错了。 3. Conclusion In summary, we have systematically investigated the ANC in the ir… view at source ↗

discussion (0)

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Reference graph

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