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arxiv: 2509.26478 · v2 · submitted 2025-09-30 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Random singlet physics in exchange disordered 2D triangular YbCu_(1.14)Se₂

Caitlin S. T. Kengle , Sean M. Thomas , Roman Movshovich , Shengzhi Zhang , Eun Sang Choi , Minseong Lee , Priscila F. S. Rosa , Allen O. Scheie This is my paper

Pith reviewed 2026-05-18 11:44 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.mtrl-sci
keywords random singlet phasequantum spin liquidtriangular latticestructural disorderfrustrated magnetismYbCu1.14Se2thermodynamic responsetwo-dimensional magnets
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The pith

Disordered triangular YbCu1.14Se2 forms random singlets rather than a quantum spin liquid.

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

The paper studies the triangular-lattice material YbCu1.14Se2, a candidate for a quantum spin liquid, and reports the absence of magnetic order down to the lowest temperatures measured. Structural disorder, however, removes clear signatures expected for a true spin liquid. The authors account for the measured thermodynamics by fitting a simple model in which singlet pairs form with a broad distribution of binding strengths. This random-singlet description also reproduces the behavior seen in other disordered triangular compounds, pointing to a shared response across the class. If the pattern holds, random singlets may be the generic ground state for exchange-disordered two-dimensional frustrated magnets.

Core claim

YbCu1.14Se2 shows neither conventional magnetic order nor compelling quantum spin liquid features because of its structural disorder. Its thermodynamic response is instead reproduced by a phenomenological model of randomly distributed singlet formation, and the material's overall behavior closely matches that of other exchange-disordered triangular-lattice systems, indicating universal random-singlet physics in two-dimensional frustrated magnets.

What carries the argument

Phenomenological distribution of singlet formation energies whose statistics reproduce the measured heat capacity and susceptibility.

If this is right

  • Magnetic order remains absent to the lowest accessible temperatures.
  • Thermodynamic quantities follow directly from the statistics of the singlet distribution.
  • The same random-singlet phenomenology describes other disordered triangular lattices.
  • Structural disorder is the primary obstacle to realizing a quantum spin liquid in this family of materials.

Where Pith is reading between the lines

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

  • Materials in the same structural family with lower disorder levels may cross over into a regime where quantum spin liquid features become visible.
  • The singlet-distribution approach offers a practical way to analyze thermodynamic data from other candidate spin-liquid compounds that contain known defects.
  • Systematic variation of disorder through doping or pressure could map the boundary between random-singlet and quantum spin liquid regimes.

Load-bearing premise

The structural disorder is strong enough to wipe out any quantum spin liquid signatures and let the random-singlet distribution fully explain the thermodynamics.

What would settle it

A sharp thermodynamic anomaly, such as a peak in specific heat or a drop in susceptibility, appearing at temperatures below those already measured would indicate an ordered or spin-liquid state not captured by the singlet-distribution model.

Figures

Figures reproduced from arXiv: 2509.26478 by Allen O. Scheie, Caitlin S. T. Kengle, Eun Sang Choi, Minseong Lee, Priscila F. S. Rosa, Roman Movshovich, Sean M. Thomas, Shengzhi Zhang.

Figure 1
Figure 1. Figure 1: (a,b) Crystal structure of YbCu1.14Se2 obtained from SC-XRD measurements. The magnetic Yb ions sit at the corners of the unit cell, forming a triangular lattice. The copper position is shown as a partially filled sphere represent￾ing its partial occupancy. (c,d) 0kl and hk0 precession images. There are no deviations from the expected Bragg peak posi￾tions for a hexagonal P lattice (yellow circles), indicat… view at source ↗
Figure 2
Figure 2. Figure 2: YbCu1.14Se2 magnetic susceptibility as a function of temperature. Panel (a) shows the susceptibility, and panel (b) shows inverse susceptibility with Curie-Weiss fits to high￾temperature and low-temperature data. The nonlinearity in χ −1 is due to crystal field effects. integrated entropy ∆S = R dT C T . The C/T plot shows sub-linear specific heat from 100 mK up to 5 K. Mean￾while, the integrated entropy b… view at source ↗
Figure 3
Figure 3. Figure 3: Zero-field heat capacity of YbCu1.14Se2. Panel (a) shows the temperature-dependent heat capacity along with a modeled Schottky anomaly and low-temperature electronic power law. Panel (b) shows C/T with the Schottky upturn subtracted alongside the singlet-distribution model in Appendix C. The black line is the model, the dashed line shows the raw singlet-distribution, and the dotted line shows the fitted T … view at source ↗
Figure 5
Figure 5. Figure 5: Calculated specific heat for distributions of singlets. [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
Figure 4
Figure 4. Figure 4: Dilution refrigerator susceptibility of YbCu [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: Susceptibility measurements at low temperature [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗
Figure 9
Figure 9. Figure 9: Calculated susceptibility for different distribu [PITH_FULL_IMAGE:figures/full_fig_p007_9.png] view at source ↗
Figure 8
Figure 8. Figure 8: Calculated specific heat for triangular distributions [PITH_FULL_IMAGE:figures/full_fig_p007_8.png] view at source ↗
Figure 10
Figure 10. Figure 10: Specific heat for YbCuxSe2 from this study and from Ref. [70] alongside LuCuSe2 data from Ref. [70]. The low temperature data do not match, indicating differences in the magnetic density of states from competing synthesis methods. [1] P. Anderson, Resonating valence bonds: A new kind of insulator?, Materials Research Bulletin 8, 153 (1973). [2] L. Savary and L. Balents, Quantum spin liquids: a re￾view, Re… view at source ↗
read the original abstract

Quantum spin liquid (QSL) phases exist in theory, but real candidate QSL materials are often extraordinarily sensitive to structural defects which disrupt the ground state. Here, we investigate candidate triangular QSL material YbCu$_{1.14}$Se$_2$ and discover the absence of magnetic order, but also no compelling evidence of a QSL ground state due to significant structural disorder. We instead look at the results through a lens of a 2-dimensional (2D) random singlet phase. We are able to match thermodynamic measurements using a phenomenological model of a distribution of singlet formation. YbCu$_{1.14}$Se$_2$ behaves strikingly similar to other disordered triangular lattice materials, suggesting universal behavior of random singlet formation in 2D frustrated 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

1 major / 1 minor

Summary. The manuscript investigates YbCu_{1.14}Se_2, a candidate triangular-lattice quantum spin liquid (QSL) material. It reports the absence of magnetic order together with no compelling QSL signatures, which the authors attribute to significant structural disorder. The data are instead interpreted within a 2D random singlet phase, with the claim that thermodynamic measurements can be reproduced by a phenomenological model based on a distribution of singlet formations. The material is said to behave similarly to other disordered triangular-lattice compounds, suggesting universal random-singlet behavior in 2D frustrated systems.

Significance. If the model were shown to be quantitatively robust and demonstrably superior to QSL alternatives, the work would help clarify how structural disorder suppresses ideal QSL states and promotes random-singlet physics, thereby contributing to the broader understanding of real versus ideal frustrated magnets.

major comments (1)
  1. [Abstract] Abstract: the central claim that a phenomenological distribution of singlet formations quantitatively accounts for the observed thermodynamics (and thereby favors random-singlet physics over a QSL ground state) is load-bearing. The abstract supplies neither the explicit functional form of the distribution, the fitting procedure, the specific observables fitted, nor any quantitative measure of agreement. Without these elements it is impossible to determine whether the reported match constitutes an independent test or a post-hoc adjustment of free parameters.
minor comments (1)
  1. [Abstract] Abstract: the title refers to 'exchange disordered' while the text discusses 'structural disorder'; a short clarifying sentence relating the two would remove potential ambiguity for readers.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for highlighting this important point about the abstract. We address the comment below and have revised the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that a phenomenological distribution of singlet formations quantitatively accounts for the observed thermodynamics (and thereby favors random-singlet physics over a QSL ground state) is load-bearing. The abstract supplies neither the explicit functional form of the distribution, the fitting procedure, the specific observables fitted, nor any quantitative measure of agreement. Without these elements it is impossible to determine whether the reported match constitutes an independent test or a post-hoc adjustment of free parameters.

    Authors: We agree that the submitted abstract is too concise and does not supply the requested details on the phenomenological model. The main text of the manuscript describes the explicit functional form of the distribution of singlet formation energies, the fitting procedure applied to the thermodynamic data, the specific observables (specific heat and magnetic susceptibility) that were fitted, and quantitative indicators of agreement. To make the abstract self-contained with respect to this load-bearing claim, we have revised it to include a brief statement of the distribution form, the observables used, and the level of quantitative agreement achieved. revision: yes

Circularity Check

1 steps flagged

Phenomenological random singlet distribution reduces thermodynamic match to a fit by construction

specific steps
  1. fitted input called prediction [Abstract]
    "We are able to match thermodynamic measurements using a phenomenological model of a distribution of singlet formation."

    The model is phenomenological, so the singlet distribution parameters are chosen to reproduce the measured thermodynamics. The reported match is therefore achieved by construction through fitting rather than emerging as a prediction from independent model equations or first-principles assumptions.

full rationale

The abstract states that thermodynamic measurements are matched using a phenomenological model of singlet formation distribution. Because the model is explicitly phenomenological, its central input (the distribution) must be adjusted to reproduce the data, rendering the reported agreement a fit rather than an independent prediction or derivation. No equations or further details are provided in the available text, and no self-citations or uniqueness theorems appear in the abstract. The universality inference is presented as a qualitative observation of similarity to other materials and does not reduce to the fit. This produces moderate circularity confined to the matching claim.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The interpretation depends on the assumption that observed thermodynamics arise from a distribution of singlet energies induced by disorder; this distribution is introduced phenomenologically without microscopic derivation from the material's structure.

free parameters (1)
  • singlet formation distribution
    A distribution of singlet energies or formation temperatures is chosen to reproduce the measured heat capacity and susceptibility.
axioms (1)
  • domain assumption Structural disorder is sufficient to suppress both magnetic order and QSL signatures
    The abstract states that significant structural disorder prevents a QSL ground state.

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Reference graph

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