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arxiv: 2502.04814 · v2 · submitted 2025-02-07 · ❄️ cond-mat.str-el

Interplay of Kondo Physics with Incommensurate Charge Density Waves in CeTe₃

Aymeric Saunot , Vesna Miksic Trontl , Ilya I. Klimovskikh , Denis V. Vyalikh , Alex Louat , Cephise Cacho , Asish K. Kumar , Elio Vescovo
show 4 more authors
Ivana Vobornik Alexander Fedorov Cedomir Petrovic Tonica Valla
This is my paper

Pith reviewed 2026-05-23 03:32 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords CeTe3charge density waveKondo hybridizationARPES4f statesheavy fermionsmomentum dependenceeffective mass
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The pith

Hybridization with Ce 4f states 260 meV below the Fermi level produces strongly momentum-dependent renormalization that reaches the Fermi surface in CeTe₃.

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

CeTe₃ hosts incommensurate charge density waves together with weak Kondo physics. ARPES data show that the hybridization between itinerant bands and the Ce 4f multiplet at -260 meV renormalizes those bands in a momentum-dependent fashion. The renormalization continues all the way to the Fermi level. Because the 4f states sit far below the Fermi energy the mass enhancement remains small and no heavy-fermion state forms. The same hybridization process, however, is expected to generate heavy fermions when the 4f levels move close to the Fermi energy, so the observed momentum dependence supplies a possible reason why specific-heat masses are often heavier than those extracted from quantum oscillations.

Core claim

The renormalization of the itinerant states originating from the hybridization with the deeper localized 4f states at -260 meV is k-dependent and extends to the Fermi level. As these localized states are far from the Fermi level, the observed hybridization affects the effective masses only marginally and does not lead to heavy fermions. However, since the same renormalizing mechanism normally leads to the heavy fermion physics when the localized 4f states are near the Fermi level, the strong k-dependence could explain the discrepancy between heavy masses in specific heat and light ones in Shubnikov-de Haas oscillations.

What carries the argument

k-dependent hybridization between itinerant conduction bands and the Ce 4f multiplet located at -260 meV

If this is right

  • The same hybridization leaves a substantial ungapped Fermi-surface pocket inside the large CDW gap.
  • Effective-mass enhancement remains modest because the 4f states sit 260 meV below the Fermi energy.
  • When the 4f states are shifted close to the Fermi energy the identical hybridization process is expected to generate heavy-fermion behavior.
  • The momentum variation of the hybridization strength can produce different effective masses depending on which region of the Brillouin zone a given probe samples.

Where Pith is reading between the lines

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

  • In heavy-fermion compounds, thermodynamic and quantum-oscillation measurements may weight different portions of momentum space and therefore report different masses.
  • The same k-dependent hybridization could be searched for in other RTe₃ compounds that lack localized f electrons to isolate the CDW contribution.
  • Shifting the 4f level position by chemical substitution or pressure would provide a direct test of whether the observed renormalization scales into the heavy-fermion regime.

Load-bearing premise

The renormalization produced by hybridization with 4f states far below the Fermi level works by the same physical mechanism that produces heavy fermions when those states lie near the Fermi level.

What would settle it

ARPES spectra showing that the band renormalization near the Fermi level is uniform across momentum or does not reach the Fermi level would remove the proposed link to the mass discrepancy.

Figures

Figures reproduced from arXiv: 2502.04814 by Alexander Fedorov, Alex Louat, Asish K. Kumar, Aymeric Saunot, Cedomir Petrovic, Cephise Cacho, Denis V. Vyalikh, Elio Vescovo, Ilya I. Klimovskikh, Ivana Vobornik, Tonica Valla, Vesna Miksic Trontl.

Figure 1
Figure 1. Figure 1: FIG. 1. Charge density waves characterization in three RTe [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Hybridization of itinerant states with localized 4 [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
read the original abstract

CeTe$_3$ is a 2--dimensional (2D) Van der Waals (VdW) material with incommensurate charge density waves (CDW), extremely high transition temperature ($T_{CDW}$) and a large momentum--dependent CDW gap that leaves a significant portion of the Fermi surface intact. It is also considered to be a weak Kondo system, a property unexpected for a material with incommensurate CDW, where each atomic site is slightly different. Here, we study the properties of the CDW state in several RTe$_3$ (R is rare earth) materials and examine the hybridization of itinerant states with the localized Ce $4f$ multiplet in CeTe$_3$ by using angle resolved photoemission spectroscopy (ARPES). We find that the renormalization of the itinerant states originating from the hybridization with the deeper localized $4f$ states at $-260$ meV is $k-$dependent and extends to the Fermi level. As these localized states are far from the Fermi level, the observed hybridization affects the effective masses only marginally and does not lead to heavy fermions. However, since the same renormalizing mechanism normally leads to the heavy fermion physics when the localized $4f$ states are near the Fermi level, our observation of its strong $k-$dependence suggests that this could be the reason for discrepancy between the heavy masses in specific heat and light ones in Shubnikov de Haas oscillations, often observed in heavy fermions.

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 presents ARPES data on CeTe₃ and related RTe₃ compounds, reporting an incommensurate CDW state and k-dependent hybridization between itinerant bands and the Ce 4f multiplet located at −260 meV. The authors observe that this hybridization extends to the Fermi level but produces only marginal mass renormalization; they suggest that the same k-dependent mechanism, when the 4f level lies near EF, could account for the common discrepancy between large specific-heat masses and lighter Shubnikov–de Haas masses in heavy-fermion systems.

Significance. If the reported k-dependence is quantitatively robust, the work supplies a concrete experimental example of momentum-dependent f–c hybridization in a weak-Kondo, CDW host. This could inform discussions of mass renormalization in periodic Anderson models, particularly the role of k-space structure when the f level is tuned toward EF. The manuscript does not, however, include model calculations or scaling arguments that map the marginal effect seen here onto the non-perturbative heavy-fermion regime.

major comments (2)
  1. [Results / ARPES analysis] The central experimental claim—that the hybridization exhibits strong k-dependence extending to EF—rests on ARPES spectra whose quantitative extraction (fitting procedure, momentum resolution, background subtraction, and error analysis) is not described in the results or methods sections. Without these details the magnitude and statistical significance of the reported k-variation cannot be assessed.
  2. [Discussion / final paragraph] The suggestion that the observed marginal renormalization is the same physical process responsible for heavy-fermion mass enhancement when the 4f level approaches EF is presented without a quantitative mapping (e.g., periodic Anderson model calculation or scaling analysis) that demonstrates continuity of the mechanism across the two regimes. The manuscript notes the effect is only marginal in CeTe₃ but does not show how the k-dependence alone produces the observed specific-heat/SdH discrepancy.
minor comments (2)
  1. [Abstract] The abstract states that the hybridization “affects the effective masses only marginally” yet supplies no numerical values or comparison to bare-band masses; a brief quantitative statement would strengthen the claim.
  2. [Figures] Figure captions and axis labels should explicitly indicate which RTe₃ compounds are shown and whether data are taken above or below T_CDW.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive comments. We address each major comment below.

read point-by-point responses

  1. Referee: [Results / ARPES analysis] The central experimental claim—that the hybridization exhibits strong k-dependence extending to EF—rests on ARPES spectra whose quantitative extraction (fitting procedure, momentum resolution, background subtraction, and error analysis) is not described in the results or methods sections. Without these details the magnitude and statistical significance of the reported k-variation cannot be assessed.

    Authors: We agree that the quantitative details of the ARPES analysis were not described with sufficient clarity. In the revised manuscript we will add a dedicated subsection to the Methods section that specifies the fitting procedure used to extract the k-dependent hybridization, the momentum resolution of the measurements, the background subtraction protocol, and the error analysis including how uncertainties on the reported k-variations were evaluated. revision: yes

  2. Referee: [Discussion / final paragraph] The suggestion that the observed marginal renormalization is the same physical process responsible for heavy-fermion mass enhancement when the 4f level approaches EF is presented without a quantitative mapping (e.g., periodic Anderson model calculation or scaling analysis) that demonstrates continuity of the mechanism across the two regimes. The manuscript notes the effect is only marginal in CeTe₃ but does not show how the k-dependence alone produces the observed specific-heat/SdH discrepancy.

    Authors: The referee correctly observes that the manuscript contains no quantitative mapping or model calculation. The final paragraph presents a qualitative suggestion based on the experimental observation of strong k-dependence; we do not claim to have demonstrated continuity to the heavy-fermion regime. We will revise the text to state explicitly that the proposal is qualitative and that a full theoretical treatment lies outside the scope of this experimental work. revision: partial

Circularity Check

0 steps flagged

No circularity: experimental ARPES observations with interpretive suggestion only

full rationale

The paper reports direct ARPES measurements of k-dependent renormalization of itinerant bands due to hybridization with Ce 4f states at -260 meV. The central suggestion—that the same mechanism could explain mass discrepancies in heavy fermions when 4f levels approach EF—is an unquantified extrapolation from the observed marginal effect, not a derivation, fit, or self-referential definition. No equations, parameter fitting, or self-citation chains reduce any claim to its own inputs by construction. The work is self-contained against external benchmarks as a measurement report.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the standard interpretation of ARPES spectra as direct probes of band hybridization; no free parameters, ad-hoc axioms, or new entities are introduced.

axioms (1)
  • domain assumption ARPES spectra can be interpreted as momentum-resolved single-particle spectral functions that reveal hybridization between itinerant and localized states.
    The entire analysis of k-dependent renormalization relies on this established condensed-matter technique.

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