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arxiv: 2605.25269 · v1 · pith:ENFYUJDVnew · submitted 2026-05-24 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Non-local low energy neutral excitations in a strongly disordered triangular Mott magnet Cr₃Se₂Br₅

Wenhao Liu , Dechen Zhang , Yuanqi Lyu , Lebing Chen , Lifang Hu , Keith M. Teddei , Yuting Zhang , Steve Shelton
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Moon Kim Xiqu Wang Michael A. Susner James G. Analytis Dung-Hai Lee Lu Li Bing Lv Robert J. Birgeneau
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Pith reviewed 2026-06-29 23:15 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.mtrl-sci
keywords disordered Mott insulatortriangular latticethermal conductivityneutral excitationsfrustrated magnetCr3Se2Br5itinerant excitationsspecific heat
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The pith

A field-independent residual linear term in thermal conductivity signals itinerant neutral excitations in a strongly disordered triangular Mott magnet.

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

The paper studies Cr₃Se₂Br₅, a van der Waals S=3/2 Mott insulator on a frustrated triangular lattice that contains substantial fixed intrinsic disorder from Cr-site deficiency and Se/Br mixing. No long-range magnetic order or glassy freezing appears, yet the material remains highly insulating. Both the magnetic specific heat C_mag/T and the thermal conductivity κ_xx/T display linear temperature dependence with large finite intercepts. The central observation is a field-independent residual κ/T of approximately 0.03 W m^{-1} K^{-2}, which the authors take as direct evidence that low-energy excitations can remain itinerant, carry entropy, and transport heat without carrying charge.

Core claim

In Cr₃Se₂Br₅, strong intrinsic disorder coexists with the absence of magnetic order; the measured field-independent residual thermal conductivity term κ/T ≈ 0.03 W m^{-1} K^{-2} demonstrates that charge-neutral itinerant excitations persist and carry entropy at low energy.

What carries the argument

The residual linear term in thermal conductivity κ/T, interpreted as the signature of itinerant neutral excitations that survive Anderson localization in the disordered frustrated Mott insulator.

If this is right

  • Itinerant neutral excitations can coexist with strong fixed disorder when frustration is present.
  • Thermal transport measurements can detect charge-neutral entropy carriers in otherwise insulating magnets.
  • The lack of conventional glassy behavior supports the non-local character of the excitations.
  • Disorder and frustration together can reshape low-energy excitations away from localized modes.

Where Pith is reading between the lines

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

  • Similar residual conductivity terms may appear in other van der Waals triangular Mott insulators with comparable disorder.
  • The excitations could be tested by searching for a corresponding contribution to the spin thermal Hall effect or other neutral transport channels.
  • This regime offers a concrete setting in which to examine whether fractionalized quasiparticles can remain mobile under strong disorder.

Load-bearing premise

The residual thermal conductivity arises from itinerant neutral excitations rather than from phonons or other bosonic modes that could produce a similar linear term.

What would settle it

A low-temperature thermal conductivity measurement that isolates phonon contributions and shows the linear term vanishes or is replaced by a T³ dependence would falsify the itinerant neutral excitation interpretation.

Figures

Figures reproduced from arXiv: 2605.25269 by Bing Lv, Dechen Zhang, Dung-Hai Lee, James G. Analytis, Keith M. Teddei, Lebing Chen, Lifang Hu, Lu Li, Michael A. Susner, Moon Kim, Robert J. Birgeneau, Steve Shelton, Wenhao Liu, Xiqu Wang, Yuanqi Lyu, Yuting Zhang.

Figure 4
Figure 4. Figure 4: Thermal conductivity of Cr3Se2Br5. The heat current was applied within the crystallographic plane, perpendicular to the 𝑐 axis, while the external magnetic field was applied along the 𝑐 axis. (a) Temperature dependence of the longitudinal thermal conductivity plotted as 𝜅𝑥𝑥/𝑇, showing a pronounced phonon peak near 13.5 K, indicating dominant phonon heat transport away from the lowest-temperature limit. (b)… view at source ↗
read the original abstract

Understanding if low-energy excitations can remain itinerant in the presence of strong disorder remains a central challenge in frustrated quantum magnets, where disorder is generally expected to localize excitations through Anderson-like mechanisms. Here we report the emergence of charge-neutral itinerant excitations in a van der Waals compound Cr$_3$Se$_2$Br$_5$, a strongly disordered $S = 3/2$ Mott insulator with a frustrated triangular lattice. Structural analysis reveals substantial intrinsic disorder arising from Cr-site deficiency and Se/Br-site mixing, which appear to be fixed and cannot be readily tuned. No long-range magnetic order or conventional glassy behavior is observed. In addition to its highly insulating nature, the magnetic specific heat C_mag/T and thermal conductivity \k{appa}_xx/T both exhibit linear temperature dependencies with substantial finite intercepts. In particular, a sizeable field-independent residual term $\kappa/T \approx 0.03~\mathrm{W\,m^{-1}\,K^{-2}}$ is observed, providing compelling evidence of itinerant low-energy excitations that carry entropy without charge. These findings conceptually advance our understanding of quantum matter by demonstrating a rare regime where the interplay of disorder, frustration, and electronic correlations actively reshapes the nature of low-energy excitations, allowing itinerant neutral excitations to coexist with strong intrinsic disorder.

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 / 1 minor

Summary. The manuscript reports the emergence of charge-neutral itinerant low-energy excitations in the van der Waals compound Cr₃Se₂Br₅, a strongly disordered S=3/2 Mott insulator on a frustrated triangular lattice. Structural disorder from Cr-site deficiency and Se/Br mixing is fixed and cannot be tuned. No long-range magnetic order or conventional glassy behavior is observed. The system is highly insulating, with both C_mag/T and κ_xx/T exhibiting linear temperature dependence and substantial finite intercepts; a field-independent residual κ/T ≈ 0.03 W m^{-1} K^{-2} is presented as compelling evidence for itinerant neutral excitations carrying entropy without charge.

Significance. If the central interpretation holds, the work addresses a key challenge in frustrated quantum magnets by demonstrating that disorder and frustration can permit delocalized neutral modes rather than localizing them. The experimental observation of a field-independent residual thermal conductivity term in a highly insulating, disordered Mott system would be a notable addition to the literature on neutral excitations, provided alternative contributions are quantitatively ruled out. The use of a van der Waals material with intrinsic, fixed disorder offers a concrete platform for such studies.

major comments (1)
  1. [Abstract and thermal transport section] Abstract and thermal conductivity results: The mapping of the observed field-independent κ/T ≈ 0.03 W m^{-1} K^{-2} intercept to itinerant neutral excitations is load-bearing for the headline claim, yet the manuscript provides no explicit phonon subtraction, mean-free-path estimate, or direct comparison of measured κ(T) to the phonon contribution expected from the measured C(T). In a strongly disordered lattice, phonon scattering can produce effective power-law behavior yielding a non-zero low-T intercept in κ/T; without this quantitative step the interpretation remains open to bosonic alternatives.
minor comments (1)
  1. [Abstract] The abstract contains a LaTeX artifact (\k{appa}); ensure consistent notation for κ_xx throughout the manuscript.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and constructive feedback. The primary concern regarding the need for explicit phonon analysis in the thermal conductivity data is addressed point-by-point below. We will incorporate the requested quantitative elements in a revised manuscript.

read point-by-point responses

  1. Referee: [Abstract and thermal transport section] Abstract and thermal conductivity results: The mapping of the observed field-independent κ/T ≈ 0.03 W m^{-1} K^{-2} intercept to itinerant neutral excitations is load-bearing for the headline claim, yet the manuscript provides no explicit phonon subtraction, mean-free-path estimate, or direct comparison of measured κ(T) to the phonon contribution expected from the measured C(T). In a strongly disordered lattice, phonon scattering can produce effective power-law behavior yielding a non-zero low-T intercept in κ/T; without this quantitative step the interpretation remains open to bosonic alternatives.

    Authors: We agree that the current manuscript would benefit from a more explicit quantitative treatment of possible phonon contributions. The field-independent residual κ/T term, combined with the linear C_mag/T and the absence of long-range order, forms the basis for the neutral-excitation interpretation, but a direct comparison is indeed not detailed in the presented text. In the revised version we will add: (1) a phonon mean-free-path estimate via the kinetic formula κ_ph = (1/3) C v l using the measured specific heat and an estimated sound velocity from the Debye model; (2) an explicit subtraction of the expected phonon term from the measured κ(T) to isolate any residual; and (3) a discussion of why strong disorder in this system is expected to suppress rather than enhance a linear-T phonon intercept (typically yielding T^2 or higher power laws at low T). The field independence remains a key discriminator, as phonons are not expected to respond to applied fields in this regime. These additions will be placed in the thermal-transport section and referenced in the abstract. revision: yes

Circularity Check

0 steps flagged

No significant circularity; experimental observations with direct interpretation

full rationale

The paper is an experimental report of measured quantities (κ_xx/T intercept, C_mag/T linear term) in a disordered material. No mathematical derivation chain, fitted parameters renamed as predictions, or self-citation load-bearing steps exist. The claim is an interpretation of data against external benchmarks (insulating behavior, lack of order), which does not reduce to its inputs by construction. This is the standard non-circular outcome for observation papers.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard condensed matter interpretations of thermodynamic and transport data in the presence of disorder.

axioms (1)
  • domain assumption Linear temperature dependence in specific heat and thermal conductivity indicates gapless or fermionic-like excitations.
    Standard interpretation in condensed matter physics for low-T behavior in insulators.

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discussion (0)

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