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arxiv: 2606.02420 · v1 · pith:XSRQANB5new · submitted 2026-06-01 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Quenching of Nonrelativistic p-Wave Spin Splitting by c-f Decoupling in CeNiAsO

Xinnuo Zhang , Zhicheng Jiang , Shibo Shen , Jian Yuan , Junseo Yoo , Changyoung Kim , Mao Ye , Jishan Liu
show 4 more authors
Zhengtai Liu Yanfeng Guo Yilin Wang Dawei Shen
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Pith reviewed 2026-06-28 12:49 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.mtrl-sci
keywords CeNiAsOp-wave spin splittingnonrelativistic spin splittingARPESheavy fermionc-f hybridizationKramers degeneracyantiferromagnetism
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The pith

Strong correlations quench the predicted p-wave spin splitting in CeNiAsO by keeping f-electrons localized.

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

The paper examines CeNiAsO, long considered a candidate for p-wave spin splitting due to its coplanar antiferromagnetic order, using ultra-low-temperature high-resolution ARPES. Measurements across the magnetic transitions show neither the expected band folding from a spin density wave nor any p-wave band splitting, with the conduction bands keeping full Kramers degeneracy. Resonant ARPES tracking of Ce 4f spectral weight finds no coherent c-f hybridization near the Fermi level, placing the 4f electrons in the localized limit. These observations demonstrate that real-space magnetic symmetries do not automatically produce momentum-space spin splittings when strong electronic correlations are present.

Core claim

In CeNiAsO the expected p-wave band splitting arising from its commensurate coplanar magnetic configuration is absent, along with any spin-density-wave band folding, so that the conduction bands retain full Kramers degeneracy. Resonant ARPES shows no coherent c-f hybridization near the Fermi level inside the magnetically ordered states, confirming that the Ce 4f electrons remain localized. The results therefore establish a many-body constraint: geometric symmetry classifications are necessary but not sufficient for nonrelativistic spin splittings once strong electronic correlations are taken into account.

What carries the argument

c-f decoupling, in which the absence of coherent hybridization between localized Ce 4f electrons and conduction bands prevents projection of the real-space magnetic symmetry onto the electronic bands.

If this is right

  • Conduction bands in CeNiAsO retain Kramers degeneracy across both magnetic transitions.
  • Ce 4f electrons remain localized with no coherent hybridization near the Fermi level in the ordered phases.
  • Geometric symmetry alone cannot guarantee nonrelativistic spin splittings in the presence of strong correlations.
  • Many-body effects impose an additional constraint beyond symmetry-based classifications for p-wave magnets.

Where Pith is reading between the lines

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

  • The same quenching mechanism may appear in other heavy-fermion antiferromagnets where f-electrons stay localized.
  • Theoretical predictions of nonrelativistic spin splitting should incorporate explicit correlation terms rather than relying on symmetry alone.
  • Candidate materials for p-wave magnets should be screened for delocalized f or d electrons before symmetry arguments are applied.

Load-bearing premise

The ultra-low-temperature high-resolution ARPES resolution and sample quality are sufficient to detect any p-wave splitting or c-f hybridization if present.

What would settle it

Observation of p-wave band splitting or signatures of coherent c-f hybridization in higher-resolution ARPES or improved samples of CeNiAsO would falsify the reported absence.

Figures

Figures reproduced from arXiv: 2606.02420 by Changyoung Kim, Dawei Shen, Jian Yuan, Jishan Liu, Junseo Yoo, Mao Ye, Shibo Shen, Xinnuo Zhang, Yanfeng Guo, Yilin Wang, Zhengtai Liu, Zhicheng Jiang.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Schematic illustration of a universal one-dimensional model generating a [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) Schematic three-dimensional Brillouin zone of CeNiAsO and its projection onto the (001) surface Brillouin zone. [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a1)-(a3) Schematic Fermi surfaces expected for the paramagnetic phase, the spin-density-wave phase below [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Resonant ARPES results and proposed mechanism for the quenching of nonrelativistic p-wave order. (a) ARPES [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
read the original abstract

The extending of spin-space group symmetries to coplanar antiferromagnets has predicted the emergence of odd-parity nonrelativistic spin splittings, making the identification of a practical $p$-wave magnet a central pursuit in spintronics. The layered heavy-fermion oxypnictide CeNiAsO has been widely regarded as the prototypical platform to verify this paradigm, as its commensurate coplanar magnetic configuration is theoretically expected to induce a robust $p$-wave band splitting. Here, we investigate the electronic structure of single-crystal CeNiAsO using ultra-low-temperature, high-resolution, and resonant angle-resolved photoemission spectroscopy (ARPES). Across the consecutive magnetic transitions into the ordered phases, our spectroscopic data reveal neither the expected band folding associated with a spin density wave nor any observable $p$-wave band splitting, demonstrating that the conduction bands retain full Kramers degeneracy. By tracking the temperature dependence of the Ce 4$f$ spectral weight via resonant ARPES, we find no evidence of coherent $c-f$ hybridization near the Fermi level within the magnetically ordered states, confirming that the Ce 4$f$ electrons operate in the localized limit. Our findings establish a clear many-body constraint on projecting real-space magnetic symmetries onto momentum-space electronic bands, demonstrating that geometric symmetry classifications constitute a necessary framework but are not a sufficient condition for nonrelativistic spin splittings in the presence of strong electronic correlations.

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 ultra-low-temperature, high-resolution resonant ARPES measurements on single-crystal CeNiAsO across its consecutive magnetic transitions. It claims that neither the band folding expected from a spin-density wave nor the p-wave spin splitting predicted by spin-space-group symmetries for the coplanar antiferromagnetic order is observed, that the conduction bands retain full Kramers degeneracy, and that resonant ARPES shows no coherent c-f hybridization near the Fermi level. The authors conclude that the Ce 4f electrons remain localized, quenching the expected nonrelativistic spin splitting and demonstrating that geometric symmetry is necessary but insufficient in the presence of strong correlations.

Significance. If the central negative result is robust, the work supplies a concrete many-body counterexample showing that real-space magnetic symmetries do not automatically produce observable momentum-space spin splittings once f-electron localization is taken into account. This supplies a useful constraint for spintronics proposals that rely on nonrelativistic p-wave magnets in heavy-fermion or correlated platforms. The resonant-ARPES tracking of f-spectral weight is a direct experimental strength that ties the spectroscopic null result to the localized limit.

major comments (2)
  1. [Results section (ARPES data across magnetic transitions)] Results section (ARPES data across magnetic transitions): the central claim that any theoretically expected p-wave splitting is absent (rather than undetected) rests on non-observation, yet the manuscript supplies no quantitative comparison between the stated energy/momentum resolution, Fermi-surface broadening, and signal-to-noise and the splitting magnitude predicted by the coplanar AF order. Without this bound the data cannot distinguish quenching by localization from a splitting below the effective resolution.
  2. [Resonant ARPES temperature-dependence analysis] Resonant ARPES temperature-dependence analysis: the conclusion that c-f hybridization is absent near EF is used to confirm the localized limit, but the manuscript does not report an upper limit on any residual hybridization gap or coherence peak intensity relative to the experimental resolution and temperature range; this limit is load-bearing for the claim that the f electrons remain fully localized across the ordered phases.
minor comments (2)
  1. [Figure captions] Figure captions and main text should explicitly state the energy and momentum resolutions achieved at the measurement temperatures and compare them directly to the theoretical splitting scale cited from prior work.
  2. [Abstract and introduction] The abstract and introduction refer to 'ultra-low-temperature, high-resolution' conditions without numerical values; these numbers should appear in the methods or first results paragraph.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments. We address each major comment below and indicate the revisions that will be incorporated.

read point-by-point responses

  1. Referee: [Results section (ARPES data across magnetic transitions)] Results section (ARPES data across magnetic transitions): the central claim that any theoretically expected p-wave splitting is absent (rather than undetected) rests on non-observation, yet the manuscript supplies no quantitative comparison between the stated energy/momentum resolution, Fermi-surface broadening, and signal-to-noise and the splitting magnitude predicted by the coplanar AF order. Without this bound the data cannot distinguish quenching by localization from a splitting below the effective resolution.

    Authors: We agree that an explicit quantitative bound is necessary to distinguish true absence from non-detection. In the revised manuscript we will add a dedicated paragraph and supplementary figure that directly compares the p-wave splitting magnitude predicted by spin-space-group symmetry for the coplanar antiferromagnetic structure against our measured energy resolution, momentum resolution, Fermi-surface linewidth, and signal-to-noise ratio. This comparison will establish a concrete upper limit on any undetected splitting, thereby reinforcing the conclusion that the observed Kramers degeneracy results from f-electron localization rather than insufficient experimental sensitivity. revision: yes

  2. Referee: [Resonant ARPES temperature-dependence analysis] Resonant ARPES temperature-dependence analysis: the conclusion that c-f hybridization is absent near EF is used to confirm the localized limit, but the manuscript does not report an upper limit on any residual hybridization gap or coherence peak intensity relative to the experimental resolution and temperature range; this limit is load-bearing for the claim that the f electrons remain fully localized across the ordered phases.

    Authors: We accept that a quantitative upper bound on residual hybridization strengthens the localized-limit interpretation. In the revised manuscript we will include an analysis that places an upper limit on any hybridization gap or coherent f-peak intensity, derived from the resonant ARPES spectra, the experimental energy resolution, and the temperature range examined. This bound will be presented together with the temperature-dependent f-spectral weight data to make the evidence for the absence of coherent c-f hybridization fully quantitative. revision: yes

Circularity Check

0 steps flagged

No circularity: purely observational experimental study

full rationale

The paper reports ARPES measurements on CeNiAsO across magnetic transitions, documenting the absence of band folding, p-wave splitting, and c-f hybridization signatures. The central claim—that geometric symmetries are insufficient for nonrelativistic spin splitting under strong correlations—follows directly from these spectroscopic observations and the temperature-dependent resonant data, without any equations, fitted parameters renamed as predictions, or self-citation chains that reduce the result to its inputs by construction. No load-bearing derivations exist to inspect for circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard assumptions about the ARPES technique and the sample's magnetic order rather than new free parameters or postulated entities.

axioms (2)
  • domain assumption The magnetic configuration of CeNiAsO is the commensurate coplanar structure theoretically expected to produce p-wave splitting.
    This sets the baseline expectation for the splitting that is reported as absent.
  • domain assumption Resonant ARPES accurately tracks the temperature dependence of Ce 4f spectral weight to determine the presence or absence of c-f hybridization.
    Used to conclude that the 4f electrons are in the localized limit.

pith-pipeline@v0.9.1-grok · 5835 in / 1369 out tokens · 35475 ms · 2026-06-28T12:49:01.865552+00:00 · methodology

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Forward citations

Cited by 1 Pith paper

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