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arxiv: 2601.02555 · v2 · submitted 2026-01-05 · ❄️ cond-mat.str-el

Influence of controlled disorder on the dipolar spin ice state of Ho-based pyrochlores

A.A. Aczel , B.R. Ortiz , Y. Luo , G. Pokharel , P.M. Sarte , C. dela Cruz , J. Liu , G. Sala
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S.D. Wilson B.A. Frandsen J.A.M. Paddison
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Pith reviewed 2026-05-16 17:05 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords dipolar spin icepyrochlorechemical disorderquantum fluctuationsnon-Kramers doubletneutron scatteringmagnetic monopolesHo pyrochlores
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0 comments X p. Extension

The pith

Controlled disorder on the B-site splits the non-Kramers doublet in Ho pyrochlores, generating tunable quantum fluctuations while the dipolar spin ice state persists.

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

This paper examines the effect of controlled chemical disorder introduced on the non-magnetic B-site in two Ho-based pyrochlores, Ho2GaSbO7 with charge disorder and Ho2ScSbO7 with added size disorder. Bulk thermodynamics and magnetic diffuse scattering show that both compounds retain the pyrochlore structure and the defining ice-rule correlations plus monopole-like excitations of the dipolar spin ice state. Inelastic neutron spectroscopy, however, detects broad low-energy magnetic excitations absent in pristine samples; the authors trace these to disorder-induced splitting of the non-Kramers ground-state doublet that acts as an effective transverse field. The central result is that the spin ice regime is remarkably robust to this disorder, yet the same disorder supplies a practical route to introduce and tune quantum fluctuations.

Core claim

Controlled chemical disorder on the B-site in Ho2GaSbO7 and Ho2ScSbO7 splits the non-Kramers ground-state doublet, producing effective transverse fields that drive broad low-energy magnetic excitations and tunable quantum fluctuations, while neutron diffuse scattering and bulk measurements confirm that the ice-rule obeying dipolar spin ice state and its monopole excitations remain intact.

What carries the argument

Disorder-induced splitting of the non-Kramers doublet, which supplies effective transverse fields that generate quantum fluctuations inside the spin ice regime.

If this is right

  • The dipolar spin ice state coexists with disorder-generated quantum fluctuations without violation of the ice rules.
  • B-site mixing offers a continuous tuning parameter for the strength of transverse-field effects in Ho pyrochlores.
  • Charge disorder alone is sufficient to produce the excitations, while added size disorder further shortens correlation lengths but does not eliminate the spin ice signatures.
  • The same mechanism could be used to stabilize hybrid classical-quantum regimes in other rare-earth pyrochlores.

Where Pith is reading between the lines

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

  • Similar controlled disorder may be applied to other spin ice candidates to explore whether quantum fluctuations can drive a transition into a quantum spin ice phase.
  • Mapping the splitting energy versus disorder concentration would allow quantitative prediction of fluctuation strength from structural data.
  • Applied magnetic fields could be used to test whether the disorder-induced transverse fields compete with or enhance monopole dynamics.

Load-bearing premise

The broad low-energy excitations arise from disorder splitting the non-Kramers doublet rather than from altered dipolar couplings or impurity phases.

What would settle it

Observation of sharp, disorder-independent low-energy excitations in higher-purity samples with minimal B-site mixing, or the same broadening appearing in stoichiometric Ho pyrochlores without intentional disorder.

Figures

Figures reproduced from arXiv: 2601.02555 by A.A. Aczel, B.A. Frandsen, B.R. Ortiz, C. dela Cruz, G. Pokharel, G. Sala, J.A.M. Paddison, J. Liu, P.M. Sarte, S.D. Wilson, Y. Luo.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Neutron powder diffraction pattern at [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) Experimental PDF patterns for Ho [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a-b) Color contour plots of the scattering intensity [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) Magnetic susceptibility, plotted as [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Magnetic diffuse scattering data (black circles), reverse Monte Carlo fits (red curves), and data–fit (blue curves) for (a) Ho [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. (a,b) Color contour intensity maps of inelastic neutron scattering from polycrystalline Ho [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
read the original abstract

Pyrochlore magnets of the form $R_2B_2$O$_7$, in which rare-earth ions on the $R$-site form a three-dimensional network of corner-sharing tetrahedra, provide a canonical setting for geometrical frustration. Ho-based pyrochlores host a dipolar spin-ice ground state, characterized by Ising moments constrained by the ice rules and elementary excitations analogous to magnetic monopoles. Here we examine how controlled chemical disorder influences this state by introducing site mixing on the non-magnetic $B$-site in two compounds. Ho$_2$GaSbO$_7$ contains only Ga$^{3+}$/Sb$^{5+}$ charge disorder, whereas Ho$_2$ScSbO$_7$ exhibits both charge and substantial size disorder arising from the large ionic-radius mismatch between Sc$^{3+}$ and Sb$^{5+}$. Although both materials retain the pyrochlore structure, neutron scattering measurements reveal a reduced correlation length for the $R/B$-site cation ordering and enhanced local structural distortions in Ho$_2$ScSbO$_7$. Despite these structural differences, bulk thermodynamic measurements and magnetic diffuse scattering demonstrate that both systems exhibit the defining signatures of a dipolar spin-ice state. Low-energy inelastic neutron spectroscopy further uncovers broad magnetic excitations that develop within the dipolar spin-ice regime, a feature absent in pristine Ho pyrochlores and indicative of disorder-induced splitting of the non-Kramers ground-state doublet. Together, these results show that controlled disorder generates tunable transverse-field-driven quantum fluctuations in Ho-based pyrochlores, although the dipolar spin-ice state is remarkably robust to this 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 / 2 minor

Summary. The manuscript examines the impact of controlled chemical disorder on the dipolar spin-ice state in two Ho-based pyrochlore compounds: Ho₂GaSbO₇ with charge disorder and Ho₂ScSbO₇ with both charge and size disorder. Using neutron scattering and bulk thermodynamic measurements, the authors report that both materials retain the defining signatures of a dipolar spin-ice state, including ice-rule correlations and monopole-like excitations. Additionally, low-energy inelastic neutron spectroscopy reveals broad magnetic excitations absent in pristine compounds, which the authors attribute to disorder-induced splitting of the non-Kramers ground-state doublet, suggesting the generation of tunable transverse-field-driven quantum fluctuations while the spin-ice state remains robust.

Significance. If the central interpretation holds, this work demonstrates the robustness of the dipolar spin-ice state to chemical disorder on the B-site while showing how controlled disorder can introduce quantum fluctuations via effective transverse fields in non-Kramers systems. It provides concrete experimental signatures (diffuse scattering, thermodynamics, and INS) that could guide future tuning of quantum effects in frustrated magnets. The use of two distinct disorder types (charge-only vs. charge+size) is a clear strength for isolating effects.

major comments (1)
  1. [inelastic neutron spectroscopy results and discussion] The attribution of broad low-energy excitations (reported in the inelastic neutron spectroscopy data) specifically to disorder-induced splitting of the non-Kramers doublet is load-bearing for the claim of tunable transverse-field-driven quantum fluctuations. The manuscript shows retention of spin-ice signatures but does not include quantitative spectral modeling, lineshape fits, or direct comparisons that exclude alternatives such as modified dipolar couplings from local distortions (noted as enhanced in Ho₂ScSbO₇) or minor impurity phases. This weakens the link between observed broadening and the proposed mechanism.
minor comments (2)
  1. [abstract and results sections] The abstract and main text would benefit from explicit statements of the quantitative criteria (e.g., specific heat features, correlation lengths from diffuse scattering) used to confirm the dipolar spin-ice state in the disordered compounds.
  2. [experimental methods and figure captions] Additional details on error bars, background subtraction, and resolution convolution in the INS data would improve clarity of the excitation broadening claim.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for the positive assessment of its significance. We address the single major comment below and will incorporate additional analysis in the revised version.

read point-by-point responses

  1. Referee: The attribution of broad low-energy excitations (reported in the inelastic neutron spectroscopy data) specifically to disorder-induced splitting of the non-Kramers doublet is load-bearing for the claim of tunable transverse-field-driven quantum fluctuations. The manuscript shows retention of spin-ice signatures but does not include quantitative spectral modeling, lineshape fits, or direct comparisons that exclude alternatives such as modified dipolar couplings from local distortions (noted as enhanced in Ho₂ScSbO₇) or minor impurity phases. This weakens the link between observed broadening and the proposed mechanism.

    Authors: We agree that quantitative spectral modeling and explicit exclusion of alternatives would strengthen the attribution. In the revised manuscript we will add lineshape fits to the low-energy INS data using a model incorporating a distribution of transverse fields from the site disorder. We will also include direct comparisons to simulations that vary the dipolar coupling strength according to the observed local distortions (stronger in Ho₂ScSbO₇) and assess possible impurity-phase contributions using the neutron diffraction data. These additions will quantify the relative importance of the proposed mechanism versus the alternatives. The correlation of the excitations with disorder level and their absence in pristine compounds already provide supporting evidence, but we accept that the modeling is required to make the interpretation fully robust. revision: partial

Circularity Check

0 steps flagged

No circularity: purely experimental study with direct measurements

full rationale

The paper reports neutron scattering, bulk thermodynamics, and structural characterization on Ho2GaSbO7 and Ho2ScSbO7. All central claims rest on direct comparison of measured quantities (magnetic diffuse scattering, inelastic spectra, heat capacity) to established dipolar spin-ice phenomenology in pristine Ho pyrochlores. No equations, parameter fits presented as predictions, self-citation load-bearing steps, or ansatz smuggling appear. The attribution of broad excitations to non-Kramers doublet splitting is an interpretation of data rather than a derivation that reduces to its own inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Experimental paper with no mathematical free parameters, axioms, or invented entities; claims rest on interpretation of scattering and thermodynamic data.

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