pith. sign in

arxiv: 2606.23413 · v1 · pith:J5NLRNSUnew · submitted 2026-06-22 · ❄️ cond-mat.str-el

Signatures of unconventional magnetism in the layered metallic ferromagnet LaCrSb₃ from ferromagnetic resonance spectroscopy

Pith reviewed 2026-06-26 06:32 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords LaCrSb3ferromagnetic resonancemagnetic sublatticesspin cantingunconventional magnetismmagneto-elastic coupling
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0 comments X

The pith

Ferromagnetic resonance data in LaCrSb3 indicates two interacting magnetic sublattices with orthogonal ferro- and antiferromagnetic order.

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

The paper maps temperature-dependent FMR modes in the layered metallic ferromagnet LaCrSb3 below its Curie temperature of about 126 K. The frequency-field diagram of these modes cannot be explained by a single ferromagnetic lattice and instead requires two magnetic sublattices. A phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices accounts quantitatively for the observed excitations. This model had previously been invoked to explain strong spin canting seen in neutron diffraction. The results also show quasi-static short-range magnetic correlations above Tc and strong magneto-elastic coupling at the transition, with no structural change detected by x-ray diffraction.

Core claim

The frequency-field diagram of the FMR modes mapped below Tc strongly suggests presence of two magnetic sublattices in LaCrSb3. A quantitative understanding of the FMR excitations was achieved within a phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices which was earlier proposed to explain unusually strong spin canting observed by neutron diffraction.

What carries the argument

phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices

Load-bearing premise

That the observed FMR frequency-field dependence can be quantitatively accounted for by the 2002 phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices without requiring additional fitting parameters or an alternative microscopic mechanism.

What would settle it

A measurement showing that the FMR resonance branches cannot be reproduced by the two-sublattice model using the same parameters that fit the neutron canting data, or that require a different number of sublattices.

Figures

Figures reproduced from arXiv: 2606.23413 by A. Alfonsov, B. B\"uchner, J. J. Abraham, R. Kolay, R. Nath, S. Samanta, V. Kataev, V. Singh.

Figure 1
Figure 1. Figure 1: FIG. 1. Orthorhombic crystal structure of LaCrSb [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Powder XRD patterns (open red circles) at (a) [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: (a) and (b), respectively. In the high tempera￾ture regime, paramagnetic behavior is observed down to T ∼ 200 K. Below this temperature, M(T) shows a large increase, suggesting the onset of a ferromagnetic (FM) transition. From the derivative dM/dT shown in the in￾set of [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Temperature evolution of the HF-ESR powder spectrum of LaCrSb [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Main panel: Frequency-field relation [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Two-dimensional color-coded view of the frequency swept FMR spectra of a single crystal of LaCrSb [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Temperature dependence of the FMR spectra (field derivatives of the microwave absorption [PITH_FULL_IMAGE:figures/full_fig_p007_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Summary [PITH_FULL_IMAGE:figures/full_fig_p008_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. (a) In-plane view of the canted FM spin structure of LaCrSb [PITH_FULL_IMAGE:figures/full_fig_p010_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Modeled spin wave excitation spectrum with param [PITH_FULL_IMAGE:figures/full_fig_p010_11.png] view at source ↗
read the original abstract

LaCrSb$_{3}$ is a metallic ferromagnet with a layered crystal structure demonstrating intriguing electronic and magnetic properties, such as large anomalous Hall effect, strong canting of the spin lattice, and a peculiar spin-reorientation transition. Here, we report the results of the temperature-dependent x-ray diffraction, static magnetization, and in particular electron spin resonance (ESR) and ferromagnetic resonance (FMR) experiments carried out over a wide range of frequencies, magnetic fields, and temperatures. Though x-ray data reveals no structural transition down to 15 K, a strong magneto-elastic coupling is detected across the ferromagnetic transition at $T_{\rm C} \simeq 126$ K. ESR results indicate a presence of the quasi-static short-range correlations extending far above $T_{\rm C}$, which is a typical fingerprint of the low-dimensional magnetism. The frequency-field diagram of the FMR modes mapped below $T_{\rm C}$ strongly suggests presence of two magnetic sublattices in LaCrSb$_{3}$. A quantitative understanding of the FMR excitations was achieved within a phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices which was earlier proposed to explain unusually strong spin canting observed by neutron diffraction [E.~Granado et al., Phys. Rev. Lett. 89, 107204 (2002)]. The FMR results corroborate this scenario and call for the development of the underlying microscopic model of unconventional magnetism in LaCrSb$_{3}$.

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

1 major / 2 minor

Summary. The manuscript reports complementary x-ray diffraction, magnetization, ESR, and broadband FMR measurements on the layered metallic ferromagnet LaCrSb3. It finds no structural transition down to 15 K but strong magneto-elastic coupling at Tc ≈ 126 K, quasi-static short-range correlations above Tc from ESR, and that the FMR frequency-field diagram below Tc indicates two magnetic sublattices whose excitations are quantitatively described by the 2002 phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices (Granado et al., PRL 89, 107204) previously used for neutron-derived spin canting.

Significance. If the FMR quantitative description holds, the work supplies independent spectroscopic evidence corroborating the two-sublattice scenario for LaCrSb3’s unconventional magnetism, including its strong canting and large anomalous Hall effect. The mapping of multiple FMR modes and their assignment to the prior model constitute a clear experimental advance that strengthens the case for this magnetic structure and motivates microscopic theory.

major comments (1)
  1. [FMR analysis section] FMR analysis section (frequency-field diagram and model comparison): the central claim that the observed modes are quantitatively accounted for by the 2002 phenomenological model 'without requiring additional fitting parameters or an alternative microscopic mechanism' is load-bearing for the abstract and conclusion; the manuscript must explicitly tabulate the anisotropy fields, exchange constants, or canting angles used in the fit and demonstrate their numerical agreement with the original Granado et al. values (or state any adjustments).
minor comments (2)
  1. Abstract: the statement of 'quantitative understanding' would be strengthened by citing at least one key model parameter or the relevant equation from the 2002 reference.
  2. Figure captions for raw FMR spectra and frequency-field plots should report fit residuals or error bars on resonance positions to allow independent assessment of the mode assignments.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment and the recommendation for minor revision. We address the single major comment below and will revise the manuscript accordingly.

read point-by-point responses
  1. Referee: [FMR analysis section] FMR analysis section (frequency-field diagram and model comparison): the central claim that the observed modes are quantitatively accounted for by the 2002 phenomenological model 'without requiring additional fitting parameters or an alternative microscopic mechanism' is load-bearing for the abstract and conclusion; the manuscript must explicitly tabulate the anisotropy fields, exchange constants, or canting angles used in the fit and demonstrate their numerical agreement with the original Granado et al. values (or state any adjustments).

    Authors: We agree that an explicit tabulation of the parameters is required to substantiate the central claim. In the revised manuscript we will add a table in the FMR analysis section that lists the anisotropy fields, exchange constants, and canting angles employed to reproduce the frequency-field diagram. The table will also show the direct numerical comparison to the corresponding values reported by Granado et al. (PRL 89, 107204, 2002), confirming that the description uses the original phenomenological parameters without additional fitting or adjustments. revision: yes

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The derivation chain rests on independent FMR frequency-field data collected in this work, which is then compared to an external phenomenological model of orthogonal ferro- and antiferromagnetic sublattices first proposed in Granado et al. (Phys. Rev. Lett. 89, 107204, 2002) by unrelated authors. The paper explicitly states that quantitative understanding is achieved within that prior model without introducing new parameters, constituting a test of the external model rather than a self-referential fit or redefinition. No equations, ansatzes, or uniqueness claims originate from self-citation chains or reduce by construction to the present paper's inputs; the 2002 citation supplies the framework while the new ESR/FMR measurements supply the test data.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the validity of the prior phenomenological model and standard assumptions of resonance spectroscopy; no new free parameters or postulated entities are introduced in the abstract.

axioms (1)
  • domain assumption The phenomenological model of interacting orthogonal ferro- and antiferromagnetic sublattices from Granado et al. (2002) provides an accurate description of the magnetic excitations.
    The abstract states that quantitative understanding was achieved within this model.

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