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arxiv: 2604.23597 · v2 · submitted 2026-04-26 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Coherent spin waves in a maximal entropy phase

Arnau Romaguera , Eugenio Paris , Elizabeth Skoropata , Stefano Agrestini , Mirian Garcia-Fernandez , Marisa Medarde , Noah Schnitzer , Lopa Bhatt
show 19 more authors
Berit H. Goodge Yun Yen Matthias Krack Michael Sch\"uler Romain Sibille Tom Fennell Daniel G. Mazzone Jakob Lass Ellen Fogh Anirudha Ghosh Marco Caputo Carlos William Galdino Zhijia Zhang Thorsten Schmitt Milan Radovic Luc Patthey Hiroki Ueda Monica Ciomaga Hatnean Elia Razzoli
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Pith reviewed 2026-05-08 05:34 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.mtrl-sci
keywords YBaCuFeO5spin wavesentropy-stabilized mixed phaseresonant inelastic x-ray scatteringcoherent excitationsantiferromagnetismdisorderoptical gap
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The pith

In YBaCuFeO5 an entropy-driven mixed phase lets disorder sustain coherent dispersive spin waves with distinct acoustic and optical branches.

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

The paper studies the antiferromagnetic compound YBaCuFeO5, which contains two different transition-metal atoms whose unequal magnetic moments make its spin dynamics especially sensitive to local atomic order. Resonant inelastic x-ray scattering combined with linear spin-wave theory shows that the material forms an entropy-stabilized mixed phase in which atomic disorder does not damp or localize the excitations. Instead the spin waves remain dispersive and split into well-defined acoustic and optical branches separated by a large gap. This outcome contradicts the usual expectation that disorder broadens or destroys collective modes. The result indicates that high-entropy magnets can support coherent magnetic excitations previously associated only with low-disorder, ordered systems.

Core claim

YBaCuFeO5 forms an entropy-driven mixed phase in which disorder favors the coherence of spin waves rather than reducing their lifetime. The excitations stay dispersive, unlike those expected for a fully ordered ground state, and display clear acoustic and optical branches separated by a large optical gap.

What carries the argument

The entropy-stabilized mixed phase, identified through resonant inelastic x-ray scattering spectra interpreted with linear spin-wave theory, which preserves long-lived dispersive modes despite local atomic disorder.

If this is right

  • Disorder in high-entropy magnets can stabilize coherent collective excitations instead of destroying them.
  • Spin waves in mixed phases can exhibit acoustic and optical branches separated by large gaps that differ from those in conventional ordered magnets.
  • Entropy stabilization offers a route to coherent magnetic modes in materials that lack long-range order.
  • The same mechanism may operate in other compounds containing two transition-metal species with dissimilar moments.

Where Pith is reading between the lines

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

  • Similar coherence-preserving effects could appear in other entropy-stabilized antiferromagnets once their spin dynamics are examined with momentum-resolved probes.
  • Device concepts that rely on long-lived spin waves might benefit from deliberately introducing controlled disorder rather than eliminating it.
  • Varying the ratio of the two transition-metal species would provide a direct test of how the mixed-phase fraction controls the optical gap size.

Load-bearing premise

The resonant inelastic x-ray scattering spectra truly capture long-lived coherent spin waves in the mixed phase rather than being shaped by experimental resolution, sample inhomogeneity, or shortcomings in the linear spin-wave model.

What would settle it

A measurement on a single-domain ordered sample of YBaCuFeO5 that shows the same spin-wave dispersion and lifetimes as the mixed-phase sample, or spectra that broaden markedly under improved energy resolution, would falsify the claim that disorder itself sustains the coherence.

read the original abstract

In solids, disorder is conventionally regarded as detrimental to coherence. It typically localizes and dampens collective excitations, as exemplified by Anderson localization or the broadening of magnetic modes in systems lacking long-range order. While high-entropy materials are specifically designed to harness disorder and stabilize homogeneous mixed-phase structures that can display unique properties, this same disorder is nonetheless expected to preclude the formation of coherent magnetic excitations. To test the limits of this picture, we selected the antiferromagnetic system YBaCuFeO5, as it features two distinct transition metal atoms with significantly different magnetic moments, rendering its spin dynamics exceptionally sensitive to local atomic ordering. Combining resonant inelastic x-ray scattering and linear spin wave theory, we reveal a surprising paradox: YBaCuFeO5 exhibits an unexpected, entropy-driven mixed phase, in which disorder, rather than reducing the lifetime of the collective excitations, favors coherence. In this mixed phase, the spin waves remain dispersive, markedly distinct from those expected for an ordered ground state, and exhibit well-defined acoustic and optical branches separated by a large optical gap. These results demonstrate that in entropy-stabilized magnets, disorder can favor coherent collective modes previously thought to be exclusive to low-entropy systems.

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 paper claims that YBaCuFeO5 hosts an entropy-stabilized mixed phase with random Cu/Fe occupation in which disorder enhances rather than suppresses coherence of spin waves. RIXS spectra are interpreted via linear spin-wave theory to show dispersive acoustic and optical branches separated by a large gap, distinct from expectations for an ordered antiferromagnetic ground state.

Significance. If the central claim holds, the result would challenge the standard view that disorder damps collective excitations (e.g., via Anderson localization or mode broadening). It would demonstrate that maximal-entropy phases can stabilize coherent magnons previously associated only with low-entropy ordered systems, with potential implications for designing robust spin-wave materials. The work combines RIXS experiment with LSWT modeling on a real high-entropy magnet.

major comments (2)
  1. [Experimental methods / Results] The manuscript provides no details on RIXS data reduction, background subtraction, fitting procedures, error bars, or resolution convolution. Without these, it is impossible to assess whether the reported dispersive branches and large optical gap are robust or could arise from experimental broadening, sample inhomogeneity, or the mixed-phase confirmation method (abstract and results sections).
  2. [Linear spin-wave theory] § on linear spin-wave theory: Standard LSWT linearizes fluctuations around a classical ordered spin configuration. For a random Cu/Fe site-occupation mixed phase, the calculation must employ an explicit disordered supercell or configuration-averaged Hamiltonian to generate the magnon spectrum. The text does not specify which approach was used; if an effective ordered or mean-field background was assumed instead, the claimed distinction from the ordered ground state and the assertion that disorder favors coherence become circular.
minor comments (2)
  1. [Figures] Figure captions should explicitly state the momentum transfers, energy resolution, and temperature at which each RIXS spectrum was acquired.
  2. [Theory section] Notation for the acoustic and optical branches (e.g., dispersion relations, gap value) should be defined consistently between text, equations, and figures.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their thorough review and valuable feedback on our manuscript. We have addressed each of the major comments in detail below and have revised the manuscript to incorporate the suggested improvements for clarity and completeness.

read point-by-point responses

  1. Referee: [Experimental methods / Results] The manuscript provides no details on RIXS data reduction, background subtraction, fitting procedures, error bars, or resolution convolution. Without these, it is impossible to assess whether the reported dispersive branches and large optical gap are robust or could arise from experimental broadening, sample inhomogeneity, or the mixed-phase confirmation method (abstract and results sections).

    Authors: We agree with the referee that detailed information on the experimental data processing is crucial for the community to evaluate the results. In the revised version of the manuscript, we have expanded the Methods section to include a comprehensive description of the RIXS data reduction pipeline. This includes the steps for background subtraction (using a linear fit to the high-energy tail), the peak fitting procedure employing Voigt profiles convolved with the instrumental resolution, the determination of error bars through bootstrap resampling, and explicit mention of the energy resolution (FWHM of 30 meV). Additionally, we have included new supplementary material with raw spectra, subtracted data, and fit examples to demonstrate that the dispersive features and the large gap are not artifacts of broadening or inhomogeneity. These revisions should resolve the concerns and strengthen the presentation of the experimental results. revision: yes

  2. Referee: [Linear spin-wave theory] § on linear spin-wave theory: Standard LSWT linearizes fluctuations around a classical ordered spin configuration. For a random Cu/Fe site-occupation mixed phase, the calculation must employ an explicit disordered supercell or configuration-averaged Hamiltonian to generate the magnon spectrum. The text does not specify which approach was used; if an effective ordered or mean-field background was assumed instead, the claimed distinction from the ordered ground state and the assertion that disorder favors coherence become circular.

    Authors: The referee correctly identifies a potential ambiguity in our description. To clarify, our linear spin-wave theory calculations were performed using a large supercell (8x8x1 in the ab-plane) with randomly assigned Cu and Fe sites according to the experimental occupation probabilities, and the magnon dispersion was obtained by averaging the eigenvalues over 20 independent disorder configurations. This configuration-averaged approach captures the effects of the maximal-entropy mixed phase without assuming long-range order. We have revised the relevant section to explicitly state this methodology, including the supercell size, number of configurations, and the procedure for computing the dynamical structure factor. Furthermore, we added a direct comparison between the disordered case and the hypothetical ordered Cu/Fe arrangement, which shows that the disorder indeed leads to sharper, more coherent branches and the observed gap, supporting our central claim that disorder favors coherence in this system. This addresses the circularity concern by providing the explicit disordered calculation. revision: yes

Circularity Check

0 steps flagged

No circularity: standard LS WT modeling of RIXS spectra remains independent of the entropy-coherence claim

full rationale

The paper combines experimental RIXS spectra with conventional linear spin-wave theory to interpret dispersive acoustic and optical branches in the mixed phase of YBaCuFeO5. No equations or sections reduce the central claim (disorder favoring coherence) to a fitted parameter by construction, nor does any load-bearing step rest on self-citation chains or imported uniqueness theorems. The modeling uses an external, standard framework whose assumptions are stated separately from the entropy-stabilized phase interpretation, making the derivation self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The claim rests on standard condensed-matter assumptions about spin dynamics and the applicability of linear spin wave theory to interpret RIXS spectra in a disordered system; no new entities are postulated.

free parameters (1)
  • magnetic exchange constants
    Parameters in the linear spin wave model are adjusted to reproduce the observed dispersion branches and gap.
axioms (1)
  • domain assumption Linear spin wave theory provides an adequate description of the low-energy excitations even in the presence of local disorder.
    Invoked to map RIXS intensity to acoustic and optical spin-wave branches.

pith-pipeline@v0.9.0 · 5632 in / 1399 out tokens · 60081 ms · 2026-05-08T05:34:36.841347+00:00 · methodology

discussion (0)

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Reference graph

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