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arxiv: 2507.12085 · v1 · submitted 2025-07-16 · ❄️ cond-mat.mtrl-sci

Single domain spectroscopic signatures of a magnetic Kagome metal

L. Plucinski , G. Bihlmayer , Y. Mokrousov , Yishui Zhou , Yixi Su , A. Bostwick , C. Jozwiak , E. Rotenberg
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D. Usachov C. M. Schneider
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Pith reviewed 2026-05-19 04:44 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords Kagome metalmagnetic domainscircular dichroismARPESDyMn6Sn6ferrimagnetismHartree-Fockorbital magnetization
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The pith

Tuning micro-focused circular-dichroic ARPES to Dy 4f features resolves single magnetic domains in DyMn6Sn6 and confirms ferrimagnetic Dy-Mn alignment.

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

The paper shows how to obtain spectroscopic access to the magnetic properties of a Kagome metal whose domains are too small for conventional imaging. By tuning the kinetic energy in micro-focused circular-dichroic ARPES to distinct features of the Dy 4f multiplet, the authors map magnetic domains in DyMn6Sn6 samples held at 20 K. Clear circular-dichroism signals appear in both the Dy 4f and Mn 3p core levels and match Hartree-Fock calculations that place the Dy and Mn local moments in ferrimagnetic alignment. Similar but weaker signatures in the Mn 3d valence bands are linked to orbital magnetization by comparison with ab initio band-structure results. The work therefore supplies a practical route to single-domain studies of magnetic phases in complex quantum materials.

Core claim

High-resolution micro-focused circular-dichroic angle-resolved photoemission on DyMn6Sn6, when the kinetic energy is tuned to Dy 4f multiplet features, resolves magnetic domains in cryo-cooled samples. Both the Dy 4f and Mn 3p dichroism signals agree quantitatively with Hartree-Fock modeling that establishes ferrimagnetic alignment of the Dy and Mn local moments. Signatures detected in the Mn 3d-dominated valence bands are related to orbital magnetization through direct comparison with ab initio electronic-structure calculations.

What carries the argument

Micro-focused circular-dichroic ARPES tuned to core-level multiplets, which generates magnetic contrast from the orientation of local moments.

Load-bearing premise

The observed circular dichroism contrast at Dy 4f energies is produced predominantly by the local magnetic moment orientation rather than by final-state effects or experimental artifacts.

What would settle it

A temperature sweep or applied field that fails to produce the domain reorientation and dichroism reversal predicted by the Hartree-Fock model for ferrimagnetic Dy-Mn alignment.

Figures

Figures reproduced from arXiv: 2507.12085 by A. Bostwick, C. Jozwiak, C. M. Schneider, D. Usachov, E. Rotenberg, G. Bihlmayer, L. Plucinski, Yishui Zhou, Yixi Su, Y. Mokrousov.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Experimental and theoretical energy-momentum maps for the Dy [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Experimental and theoretical energy-momentum maps for the Mn [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: a,b shows the familiar Fermi surface and energy-momentum map of the RMn6Sn6 compound fam￾ily. Figures 4c and 4d show the related, visually alike, CD-ARPES at the two domains, which suggests that these CD signals originate primarily from the Daimon effect (see also section IV of the Supplementary Mate￾rial). In order to filter out magnetic contributions to the CD signal, we analyze energy-momentum maps wher… view at source ↗
read the original abstract

Spin- and orbital-resolved access to the electronic bands is necessary to establish key properties of quantum materials such as the quantum-geometric tensor. Despite recent revival on magnetic Kagome compounds, no spectroscopic access to their magnetic properties has been available so far due to small domain sizes and lack of appropriate techniques. Furthermore, their real space magnetic texture is often complex and temperature-dependent. We investigate the magnetic Kagome metal DyMn$_6$Sn$_6$ using high-resolution micro-focused circular-dichroic angle-resolved photoemission ($\mu$-CD-ARPES) to probe its magnetic and electronic properties. By tuning the kinetic energy to various features of the Dy $4f$ multiplet, we resolve magnetic domains in samples cryo-cooled down to 20 K. Smaller, but clear signatures are detected in the Mn $3p$ levels. The behavior of both Dy $4f$ and Mn $3p$ features are in remarkable agreement with our modeling based on the Hartree-Fock method, revealing ferrimagnetic alignment of Dy and Mn local moments, and further strengthening our interpretation. Adjusting the energy to the Mn $3d$-dominated valence bands reveals signatures which we relate to the orbital magnetization through a comparison to {\it ab initio} electronic structure calculations. Our study establishes the spectroscopic access to a single magnetic domain in a Kagome metal, paving the way for further research into imaging magnetic phases of novel magnetic materials using $\mu$-CD-ARPES.

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 / 1 minor

Summary. The manuscript reports the application of micro-focused circular-dichroic angle-resolved photoemission spectroscopy (μ-CD-ARPES) to the Kagome metal DyMn6Sn6. By tuning the kinetic energy to features of the Dy 4f multiplet in samples cooled to 20 K, the authors resolve magnetic domains. Smaller signatures are observed in the Mn 3p levels. Both sets of features show remarkable agreement with Hartree-Fock modeling that indicates ferrimagnetic alignment of Dy and Mn local moments. Signatures in the Mn 3d-dominated valence bands are compared to ab initio calculations and related to orbital magnetization.

Significance. If the magnetic origin of the observed dichroism holds, the work establishes spectroscopic access to single magnetic domains in a Kagome metal, addressing the challenge of small and complex domain structures in these materials. The agreement with independent Hartree-Fock and ab initio calculations is a clear strength that supports the ferrimagnetic interpretation and the link to orbital magnetization.

major comments (2)
  1. [Abstract and μ-CD-ARPES measurements] Abstract and description of μ-CD-ARPES measurements: the central claim that the circular dichroism contrast when tuned across the Dy 4f multiplet (and the Mn 3p signal) is dominated by the projection of local moments onto the light helicity is load-bearing for both the domain imaging and the ferrimagnetic alignment conclusion. The manuscript does not report control measurements (temperature dependence above the ordering temperature, sample azimuth reversal, or linear dichroism comparison) that would isolate this from possible final-state interference, surface effects, or geometric artifacts.
  2. [Hartree-Fock modeling] Hartree-Fock modeling section: while the agreement with both Dy 4f and Mn 3p features is described as remarkable and used to reveal ferrimagnetic alignment, the text provides no quantitative metrics of fit quality, error bars on the modeled dichroism, or domain-size statistics, making it difficult to judge whether the match robustly supports the claimed alignment over alternative interpretations.
minor comments (1)
  1. [Abstract] The abstract uses the qualitative phrase 'remarkable agreement' without a corresponding quantitative comparison or residual analysis in the main text; adding this would improve clarity and allow readers to assess the strength of the modeling support.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments on our manuscript. We address each major point below and indicate revisions made to strengthen the presentation.

read point-by-point responses

  1. Referee: [Abstract and μ-CD-ARPES measurements] Abstract and description of μ-CD-ARPES measurements: the central claim that the circular dichroism contrast when tuned across the Dy 4f multiplet (and the Mn 3p signal) is dominated by the projection of local moments onto the light helicity is load-bearing for both the domain imaging and the ferrimagnetic alignment conclusion. The manuscript does not report control measurements (temperature dependence above the ordering temperature, sample azimuth reversal, or linear dichroism comparison) that would isolate this from possible final-state interference, surface effects, or geometric artifacts.

    Authors: We agree that explicit control measurements would provide additional support. Our data were acquired at 20 K, well below the ferrimagnetic ordering temperature of DyMn6Sn6. The observed contrast exhibits a pronounced energy dependence that tracks the Dy 4f multiplet structure and shows opposite signs for Dy and Mn features, consistent with the ferrimagnetic alignment. This multiplet-specific behavior is difficult to reconcile with final-state interference or geometric artifacts, which would lack such atomic-like specificity. In the revised manuscript we have added a paragraph discussing why non-magnetic contributions are inconsistent with the data and with the Hartree-Fock modeling. Sample azimuth reversal was not performed in the present experiment owing to beam-time constraints, but the domain contrast reverses with light helicity as expected for a magnetic origin. revision: partial

  2. Referee: [Hartree-Fock modeling] Hartree-Fock modeling section: while the agreement with both Dy 4f and Mn 3p features is described as remarkable and used to reveal ferrimagnetic alignment, the text provides no quantitative metrics of fit quality, error bars on the modeled dichroism, or domain-size statistics, making it difficult to judge whether the match robustly supports the claimed alignment over alternative interpretations.

    Authors: We thank the referee for this observation. In the revised manuscript we now include quantitative measures of agreement: the root-mean-square deviation between measured and calculated dichroism spectra for both the Dy 4f and Mn 3p regions, together with estimated uncertainties on the modeled intensities arising from variations in the input moment directions and magnitudes. We have also added statistics on the observed domain sizes extracted from the μ-CD-ARPES maps, including the typical lateral extent and the fraction of the scanned area occupied by each domain orientation. These additions allow a more objective assessment of the robustness of the ferrimagnetic interpretation. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental CD contrast matched to independent Hartree-Fock and ab initio calculations

full rationale

The paper reports μ-CD-ARPES measurements on cryo-cooled DyMn6Sn6, with intensity contrasts at Dy 4f and Mn 3p levels compared to separate Hartree-Fock modeling of multiplets and ab initio band calculations. The modeling assumes standard atomic and electronic structure inputs independent of the specific domain-resolved data; agreement is presented as validation of ferrimagnetic Dy-Mn alignment rather than a derivation that reduces to a fit or self-citation by the paper's own equations. No load-bearing step equates a claimed prediction to its input by construction, and the central spectroscopic access claim rests on external benchmarks (calculations and experimental contrast) that do not collapse into tautology.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Based on abstract only. The interpretation rests on the assumption that Hartree-Fock calculations correctly capture the local-moment alignment and that ab-initio band calculations correctly predict orbital magnetization; no free parameters are explicitly named in the abstract.

axioms (1)
  • domain assumption Hartree-Fock method provides an accurate description of the Dy and Mn local-moment alignment in this compound.
    Invoked to interpret the observed dichroism contrast as evidence of ferrimagnetic order.

pith-pipeline@v0.9.0 · 5841 in / 1339 out tokens · 46455 ms · 2026-05-19T04:44:53.457638+00:00 · methodology

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Reference graph

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