{"id":"99e3b3cf-077a-4471-bd56-656b1e6e5b8b","arxiv_id":"1908.05070","paper_version":3,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":7.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":4,"one_line_summary":"Monte Carlo simulations of a disorder-free pyrochlore model show that Heisenberg spins and Jahn-Teller orbital distortions freeze simultaneously at Tc≈0.07J, with divergent nonlinear magnetic and dielectric susceptibilities.","lead":"A computer model of a magnetic crystal shows that magnetism and tiny atomic shifts can freeze together like glass, even though the material has no built-in randomness. This could explain why a clean compound, Y2Mo2O7, behaves as a spin glass, and it predicts an electric-field-based test.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"Orbital variables may freeze as an artifact of single-spin-flip dynamics in the ice-rule manifold, reducing the claimed disorder-free spin-orbital glass to an effective quenched-random-bond spin glass.","rationale":"The reader's weakest assumption and my own concern are the same: the orbital variables must remain thermalized and dynamically mobile up to Tc, or the model collapses to an Edwards-Anderson random-bond model with quenched disorder. This is genuinely load-bearing because the paper's novelty claim, a thermodynamic glass transition without quenched disorder in a periodic lattice, depends on the σ variables being part of the fluctuating degrees of freedom at the transition. The existing evidence, τσ from single-spin-flip dynamics, is not decisive because single-spin-flip dynamics in an ice-rule system is exponentially slowed by the constraint even when there is no thermodynamic transition. The supplementary material's smooth ice-fraction growth and broad heat-capacity hump at higher T show that the σ subsystem becomes strongly constrained above Tc, but no static overlap or spin-glass susceptibility for σ is provided. The proposed pure-σ baseline test cleanly separates the trivial ice-rule slowdown from a genuinely cooperative spin-induced freezing. I therefore keep the reader's CONDITIONAL verdict: the claim is plausible and the model is original, but the orbital-ergodicity premise needs to be established before the 'thermodynamic glass transition without quenched disorder' can be accepted. The nonlinear susceptibility predictions in Eqs. (3)-(4) are a valuable falsifiable output, and the microscopic derivation from the Kanamori Hamiltonian is a strength.","tokens_in":25353,"tokens_out":8893,"duration_ms":105072,"concrete_test":"Run the identical Monte Carlo protocol with the spin-exchange coupling switched off (J = 0 in Eq. (1), leaving only H_σ = -ε Σ σ_i·σ_j), using the same single-spin-flip dynamical update, the same temperature range, and the same 3×10^7 MCS observation window, and measure τσ(T) and the time-dependent ice-rule fraction. If this spin-free baseline shows τσ growing with the same power-law form (or the σ configurations appearing frozen) in the same T window around 0.07, then the orbital contribution to the claimed transition is an artifact of the σ update algorithm, and the coupled-model transition should be reinterpreted as an effective quenched-random-bond spin glass. If instead τσ in the spin-free baseline remains finite and the σ variables remain ergodic down to T ≈ 0.07, then the simultaneous freezing is genuinely induced by the spin-orbital coupling, supporting the paper's claim.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim requires that the orbital (σ) variables stay thermally active and keep exploring the ice-rule manifold up to the cooperative Tc ≈ 0.07, so that the spins experience self-generated, dynamic disorder rather than quenched randomness. The only dynamical evidence for orbital mobility near Tc is the power-law divergence of τσ extracted from single-spin-flip Metropolis dynamics (Fig. 2(c,d)). However, the σ subsystem alone is an ice-rule system: the SI (Figs. S3, S4) shows a broad heat-capacity hump and a smoothly increasing ice-rule fraction at higher temperatures, i.e. the σ variables enter a strongly constrained manifold well above Tc. Single-spin-flip moves in that manifold require creating ice-rule defects and slow down dramatically with decreasing temperature even in the spin-free ice model, which has no thermodynamic transition. The paper provides no equilibrium static probe of σ freezing, such as a σ spin-glass susceptibility or a replica-overlap analysis, that would separate thermodynamic freezing from slow but ergodic ice-rule dynamics. If the σ configuration is effectively frozen on the observation timescale before the spins freeze, then, as the authors themselves note in the final section, the model reduces to the Edwards-Anderson random-bond Heisenberg model on the pyrochlore lattice (Refs. [61,62]) and the observed transition is an ordinary quenched-disorder spin glass, not a disorder-free simultaneous spin-orbital glass. Thus the 'disorder-free' part of the central claim rests entirely on the unverified assumption that the single-spin-flip τσ measures cooperative spin-orbital freezing rather than the trivial slowdown of an ice-rule system.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"The paper introduces a disorder-free classical spin-orbital model on the pyrochlore lattice, Eqs. (1)-(2), in which Heisenberg spins S_i are coupled to lattice-displacement/orbital variables σ_i through a σ-dependent exchange constant that can change sign, plus an ice-rule elastic term. Using extensive Monte Carlo simulations with replica exchange, loop updates, and single-spin-flip dynamics, the authors report a power-law divergence of both spin and orbital relaxation times at a common temperature T_c ≈ 0.07 (for ε = 0.6) and at T_c ≈ 0.086 (for ε = 0.65), scaling collapse of the autocorrelation functions, and a negative divergence of both the nonlinear magnetic susceptibility χ3 and the nonlinear dielectric susceptibility χ3^σ. They interpret these results as a simultaneous thermodynamic spin-orbital glass transition, proposing that the two degrees of freedom act as self-generated dynamical disorder for each other, thereby resolving the long-standing puzzle of the disorder-free spin glass in Y2Mo2O7.","tokens_in":25660,"tokens_out":9639,"duration_ms":101301,"significance":"If the central claim holds, this is the first demonstration of a thermodynamic glass transition without quenched disorder in a finite-dimensional periodic lattice, which would be a major conceptual advance. The numerical work is substantial: 120 independent runs for L = 4, 5, 6, 8, replica-exchange equilibration with loop updates, two values of ε, scaling collapse of autocorrelation functions, and the observation of negative diverging nonlinear susceptibilities. The effective exchange interaction is derived from a microscopic Kanamori-type calculation, supporting the realism of the model. The prediction of a diverging nonlinear dielectric susceptibility is a falsifiable experimental signature that could be tested in pyrochlore oxides. The paper is likely to be influential if the thermodynamic interpretation survives scrutiny.","major_comments":[{"comment":"The central claim of a thermodynamic spin-orbital glass transition presumes that the σ variables remain dynamically active at T_c and freeze cooperatively with the spins. The only equilibrium static probe of the σ subsystem is the nonlinear dielectric susceptibility χ3^σ in Fig. 4(b); no spin-glass correlation function or correlation length for the σ variables is presented, and χ3^σ is not analyzed with a finite-size scaling collapse. The authors themselves note in the final paragraph that if the orbitals froze at a higher temperature, the model would reduce to the Edwards-Anderson random-bond Heisenberg model of Refs. [61,62]. To exclude this scenario, please provide a finite-size scaling analysis of χ3 and χ3^σ (e.g., χ3 L^{-γ/ν} versus (T-T_c)L^{1/ν}) with a common T_c, or a static spin-glass correlation function for σ whose correlation length diverges at T_c. Without this, the simultaneous power-law divergence of τ_s and τ_σ, while suggestive, does not by itself distinguish a cooperative glass transition from a conventional quenched-disorder spin glass in which the orbital variables are merely slow.","section":"Main text, Fig. 4 and final paragraph"},{"comment":"The power-law fits τ = A (T-T_c)^{-zν} for spins and orbitals are based on data at a single system size (L=6 in the main text; L=5 at ε=0.65 in the SI) and involve three free parameters. The text does not specify the temperature range used in the fits, the number of points, or the sensitivity of the fitted T_c to the fitting window. The assertion 'We checked that there is no finite size effect within the time scale which we analyzed' is not documented. Please provide (i) the fit range and residuals, (ii) a table of T_c and zν with and without the lowest-temperature point, and (iii) a finite-size scaling plot of τ(L,T) (e.g., τ L^{-z} versus (T-T_c)L^{1/ν}) using L=4,5,6,8 to demonstrate that the power-law divergence is not an artifact of a single finite system.","section":"Fig. 2(b,d) and SI"},{"comment":"The conclusion that χ3 and χ3^σ diverge at T_c is based on the visual increase of the magnitude with L in Fig. 4. No scaling collapse or exponent estimates are given, and no direct comparison with the T_c extracted from the dynamics is made. A skeptic could interpret the growth as a finite-size precursor from a growing but finite correlation length. Please perform a scaling collapse of both susceptibilities to verify a divergence at the same T_c, and estimate the exponent γ. If the data range does not permit a reliable collapse, the claim should be softened accordingly.","section":"Fig. 4 and Eqs. (3)-(8)"}],"minor_comments":[{"comment":"The word 'pyrhoclore' is a typo and should be 'pyrochlore'.","section":"Introduction, first paragraph"},{"comment":"The phrase 'In contrast,, any of the theories available at present' contains a double comma; also, the sentence is a fragment and should be rephrased.","section":"Introduction, second paragraph"},{"comment":"The caption of Fig. 1(d) does not specify the values of UMo and UO used for the plotted curves, nor the meaning of the shaded region; please clarify the parameters and the range of UO variation.","section":"Fig. 1(d) and SI"},{"comment":"The definition of Sσ(k) in the main text, Sσ(k) = (4N)^{-1}|∑_{i=1}^{4} ∑_{j=1}^{N} e^{-ik·(r_j-r_i)} σ_i·σ_j|, appears to have a summation index that is not clearly defined; please spell out the sublattice convention used in the sum.","section":"Structure factor definition"},{"comment":"The statement 'our findings proved that the interplay of nearest-neighbor interactions and the dynamical JT distortions can solely drive the system to the glass transition' uses 'proved' too strongly for numerical evidence; consider replacing it with 'provide strong evidence' or 'indicate'.","section":"Conclusion"},{"comment":"The sentence 'The 2ndary peak of the heat-capacity observed at large ϵ can be interpreted as due to the onset of the ice like structures' contains the typo '2ndary' and should be reworded to clarify that the feature is a crossover, not a thermodynamic transition.","section":"SI, Heat capacity section"},{"comment":"The paper defines χ3^σ as a response to a conjugate field Eν, but does not specify the physical coupling between σ_i and the electric field in the material. Please clarify how the dielectric polarization pν is related to the lattice displacement in Y2Mo2O7, so that the predicted divergence is meaningful as an experimentally measurable dielectric response.","section":"Definition of nonlinear dielectric susceptibility"}],"recommendation":"major_revision","confidential_remarks":"The paper addresses a high-impact question and the numerical effort is commendable. The main risk is the interpretation of the orbital dynamics: without a static probe or finite-size scaling of the susceptibilities, the claim of a thermodynamic glass transition is not fully secured. I believe the authors can address the major comments with additional analysis of existing data; the simultaneous T_c from the two independent dynamical fits is a strong point that deserves more emphasis. Please also ask the authors to clarify the experimental connection of χ3^σ, as this is the falsifiable prediction of the paper."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Short version: this is a serious candidate explanation for the Y2Mo2O7 puzzle. The model dynamically couples classical Heisenberg spins to ice-rule Jahn-Teller displacements, generating self-induced random exchange. That is genuinely new, and the paper earns its claim that the frozen-orbital limit reduces to the known quenched-disorder pyrochlore spin-glass models. The Monte Carlo work is careful: 120 runs, sizes L=4-8, replica exchange plus loop updates, two values of epsilon, scaling collapse of autocorrelations. The negative divergence of both chi3 and chi3^sigma is a sensible thermodynamic fingerprint, and the dielectric prediction is a real falsifiable output that experiments can check.\n\nThe main soft spot is the burden of calling this a thermodynamic transition. The divergence of relaxation times is dynamic, and the sigma subsystem is an ice-rule system whose single-spin-flip dynamics slow down even without a transition. The stress-test worry that sigma might freeze first is real but partly answered: the paper computes a static nonlinear dielectric susceptibility, which diverges near the same Tc. That is exactly the kind of probe that would distinguish thermodynamic freezing from slow ice-rule dynamics. So the doomsday scenario doesn't fully land. What is missing is a more conventional static glass-order analysis: a spin-glass susceptibility with replica overlap for both spins and sigma, a Binder cumulant, or a scaling collapse of chi3 with system size. The size dependence shown in Fig. 4 is suggestive but not a thermodynamic-limit extrapolation.\n\nAlso minor: the parameters delta=1.5 and epsilon=0.6 are rationalized but not scanned broadly; only two epsilon values are used for the dynamics. The heat capacity for epsilon=0.6 shows a single broad peak near Tc, consistent with a transition, but the absence of a clear latent heat or order parameter is typical for glass transitions.\n\nThe paper is honest about the frozen-orbital limit in the final section, and the microscopic derivation from the Kanamori model is a real strength. If I were refereeing, I would ask for code/data and for a finite-size scaling of the static glass susceptibility, but I would not reject on the current evidence. This deserves a serious referee.","headline":"A plausible microscopic route to a disorder-free spin glass in Y2Mo2O7, with a testable dielectric signature; the evidence is strong but the thermodynamic label needs more static finite-size analysis.","tokens_in":26239,"tokens_out":2047,"would_cite":true,"duration_ms":21895,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":["75.50.Lk","71.70.Ej"],"model":"deepseek-v4-flash","headline":"A disorder-free model of the pyrochlore magnet Y2Mo2O7 claims a genuine thermodynamic spin-orbital glass transition, with spins and Jahn-Teller distortions freezing together near T_c ≈ 0.07J.","keywords":["spin glass","pyrochlore lattice","Jahn-Teller distortion","orbital glass","quenched disorder","nonlinear susceptibility","frustration","Monte Carlo simulation"],"falsifier":"An experiment on Y2Mo2O7 measuring the nonlinear dielectric susceptibility χ3^σ across the known spin-glass freezing temperature would settle the central claim: if χ3^σ shows no negative divergence at the same temperature at which the magnetic χ3 diverges, the simultaneous-freezing scenario is wrong. On the numerical side, if longer equilibration or larger lattices show the relaxation times saturating rather than continuing to diverge, the would-be transition is a finite-time crossover.","tokens_in":25141,"feed_emoji":"🧲","tokens_out":9865,"duration_ms":93470,"temperature":0.7,"pith_summary":"This paper sets out to explain why the pyrochlore oxide Y2Mo2O7, a crystal with no chemical or structural disorder, behaves like a spin glass. The proposed answer is a model in which Heisenberg spins and Jahn-Teller lattice-distortion (orbital) variables are coupled: the distortions modulate the exchange between spins, swinging it from ferromagnetic to antiferromagnetic, while the spins in turn bias the distortions. The paper reports Monte Carlo evidence that both degrees of freedom freeze at the same temperature, T_c ≈ 0.07J, with relaxation times diverging as power laws and with both the magnetic and the dielectric nonlinear susceptibilities diverging to negative values. If correct, this would be the first instance of a genuine thermodynamic glass transition in a periodic, three-dimensional lattice with no quenched disorder, and it would resolve a long-standing puzzle about the origin of the spin-glass transition in Y2Mo2O7.","feed_headline":"No disorder needed: spins and distortions freeze together","feed_subtitle":"A disorder-free pyrochlore model predicts simultaneous spin and distortion freezing, with a dielectric signal experiments can check.","key_machinery":"The load-bearing object is the coupled Hamiltonian of Eqs. (1)-(2): a pyrochlore-lattice Heisenberg model whose exchange constants are controlled by binary Jahn-Teller displacement variables σ_i, plus an elastic ice-rule term -ε Σ_{<ij>} σ_i·σ_j. The displacements live on an ice-rule manifold of huge degeneracy, and the spins alone are likewise degenerate because of geometrical frustration. The coupling makes the effective exchange felt by each spin depend on the instantaneous distortion pattern, and the effective field felt by each distortion depend on the spin configuration, so neither subsystem is quenched; each continually generates the randomness the other responds to. The model's key observable signatures are the autocorrelation times, which diverge at a common T_c, and the two nonlinear susceptibilities, whose negative divergence identifies glassy freezing in both channels.","core_discovery":"The central claim is that the spin-glass transition observed in Y2Mo2O7 can arise from the mutual dynamical coupling of two frustrated degrees of freedom, with no quenched randomness in the Hamiltonian. The model places classical Heisenberg spins S_i on the pyrochlore lattice and assigns each Mo ion a binary in/out displacement σ_i selected by the Jahn-Teller effect; the exchange coupling J_{σ_i,σ_j} = J[1 + δ(\\hat{r}_{ij}·σ_i + (-\\hat{r}_{ij})·σ_j)] takes different values for in-in, in-out, and out-out bonds, so the spin system sees a time-dependent mixture of ferromagnetic and antiferromagnetic bonds. At parameters δ = 1.5 and ε = 0.6, equilibrium Monte Carlo simulations with dynamical single-spin updates find that the spin and orbital autocorrelation times diverge at the same temperature T_c ≈ 0.07J with different power-law exponents, that neither degree of freedom develops long-range order, and that both the magnetic nonlinear susceptibility χ3 and the dielectric nonlinear susceptibility χ3^σ grow negatively and diverge as the system size increases. The authors conclude that the two subsystems freeze cooperatively, each acting as dynamical disorder for the other, and that the freezing is a thermodynamic transition rather than a crossover.","pith_inferences":["A sharper experimental test than the paper states explicitly would be to measure the nonlinear dielectric susceptibility of Y2Mo2O7 across the known spin-glass temperature as a function of frequency: the scenario predicts a strong, frequency-dependent divergence tied to the magnetic transition, whereas an orbital-freezing-first picture predicts no such electric anomaly at that temperature.","The mechanism suggests a design rule for finding other disorder-free glasses: look for crystals with two frustrated degrees of freedom coupled by a sign-changing interaction; Jahn-Teller-active pyrochlores such as Tb2Mo2O7, mentioned briefly in the paper, are natural candidates for a search for simultaneous magnetic and dielectric glassy anomalies.","Because the central evidence comes from finite-time Monte Carlo, the most decisive numerical check would be to test whether the divergence survives with systematically longer equilibration and larger system sizes; if relaxation times instead saturate, the would-be transition is a very slow crossover.","If correct, the result reframes the notion of a glass transition in crystals: thermodynamic glassiness need not be inherited from frozen-in randomness but can emerge from the dynamics of clean frustrated degrees of freedom, motivating a re-examination of other anomalous spin glasses for hidden orbital or lattice degrees of freedom."],"forward_implications":["A direct experimental prediction follows: the nonlinear dielectric susceptibility of Y2Mo2O7 should show a negative divergence at the same temperature where its magnetic nonlinear susceptibility diverges.","The simultaneous freezing implies that the spin-glass state in a clean pyrochlore does not require quenched disorder; the Jahn-Teller distortions play the role of self-generated randomness.","Because the spin and orbital relaxation times diverge with different power-law exponents at one common T_c, the transition is cooperative rather than caused by one degree of freedom freezing first.","Varying the elastic energy parameter to ε = 0.65 shifts T_c to roughly 0.086J while leaving the critical exponents essentially unchanged, suggesting a common universality class.","If instead the distortions froze at a higher temperature, the model would reduce to the known Edwards-Anderson-type random-bond spin glass on the pyrochlore lattice, so the observed divergence pattern is what distinguishes the two scenarios."],"supporting_citations":[{"why":"Supplies the neutron pair-distribution evidence of local in/out Mo displacements that motivates the σ variables.","marker":"[19]"},{"why":"Documents the large variance of Mo-Mo distances used to justify a wide distribution of exchange couplings.","marker":"[20]"},{"why":"Provides the electronic-structure input showing the exchange sign changes with the Mo-O-Mo angle.","marker":"[43]"},{"why":"Establishes that purely antiferromagnetic nearest-neighbor Heisenberg spins on the pyrochlore lattice remain disordered, motivating the extra degrees of freedom.","marker":"[45]"},{"why":"Shows that a random-bond Heisenberg model on the pyrochlore lattice has a spin-glass transition, providing the quenched-disorder baseline.","marker":"[61]"},{"why":"Provides the Edwards-Anderson-type pyrochlore spin-glass model to which the present model reduces if orbitals freeze first.","marker":"[62]"},{"why":"Supports the interpretation that ice-rule orbital dynamics can slow down without a thermodynamic anomaly before the transition.","marker":"[63]"},{"why":"Documents the experimental spin-glass transition and nonlinear susceptibility divergence in Y2Mo2O7 that the model aims to explain.","marker":"[15]"},{"why":"Shows that dielectric spectroscopy can detect an orbital glass, the experimental route proposed for the dielectric test.","marker":"[60]"}],"fun_headline_variants":["Spins and orbitals freeze together without disorder","Disorder-free spin glass from spin-orbital coupling","Pyrochlore model: spins and distortions freeze in sync","Two frustrations, one glass: no disorder needed"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The argument assumes that the lattice-distortion variables remain thermally active and keep exploring their many equivalent configurations up to and through the claimed transition, so the randomness felt by the spins is generated by the moving distortions themselves; if the distortions effectively froze first, the model would just be a standard quenched-random-bond spin glass.","fun_headline_variants_meta":{"raw":{"variants":["Spins and orbitals freeze together without disorder","Disorder-free spin glass from spin-orbital coupling","Pyrochlore model: spins and distortions freeze in sync","Two frustrations, one glass: no disorder needed"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000297,"raw_usage":{"total_tokens":1708,"prompt_tokens":919,"completion_tokens":789,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":535,"completion_tokens_details":{"reasoning_tokens":726}},"tokens_in":535,"tokens_out":789,"duration_ms":7646,"temperature":1.0,"reasoning_tokens":726,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-14T13:25:10.807772+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"An experiment on Y2Mo2O7 measuring the nonlinear dielectric susceptibility χ3^σ across the known spin-glass freezing temperature would settle the central claim: if χ3^σ shows no negative divergence at the same temperature at which the magnetic χ3 diverges, the simultaneous-freezing scenario is wrong. On the numerical side, if longer equilibration or larger lattices show the relaxation times saturating rather than continuing to diverge, the would-be transition is a finite-time crossover.","supporting_citations":[{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Supplies the neutron pair-distribution evidence of local in/out Mo displacements that motivates the σ variables."},{"cited_title":"Greedan, M","cited_arxiv_id":null,"evidence_quote":"Documents the large variance of Mo-Mo distances used to justify a wide distribution of exchange couplings."},{"cited_title":"Hukushima and H","cited_arxiv_id":null,"evidence_quote":"Provides the electronic-structure input showing the exchange sign changes with the Mo-O-Mo angle."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Establishes that purely antiferromagnetic nearest-neighbor Heisenberg spins on the pyrochlore lattice remain disordered, motivating the extra degrees of freedom."},{"cited_title":"Melko, B","cited_arxiv_id":null,"evidence_quote":"Shows that a random-bond Heisenberg model on the pyrochlore lattice has a spin-glass transition, providing the quenched-disorder baseline."},{"cited_title":"Pawig and K","cited_arxiv_id":null,"evidence_quote":"Provides the Edwards-Anderson-type pyrochlore spin-glass model to which the present model reduces if orbitals freeze first."},{"cited_title":"Alonso and et al., Physical Review B 53, 2537 (1996)","cited_arxiv_id":null,"evidence_quote":"Supports the interpretation that ice-rule orbital dynamics can slow down without a thermodynamic anomaly before the transition."},{"cited_title":"Ladieu, F","cited_arxiv_id":null,"evidence_quote":"Documents the experimental spin-glass transition and nonlinear susceptibility divergence in Y2Mo2O7 that the model aims to explain."},{"cited_title":"Hukushima, Physical Review E 60, 3606 (1999)","cited_arxiv_id":null,"evidence_quote":"Shows that dielectric spectroscopy can detect an orbital glass, the experimental route proposed for the dielectric test."}],"review_version":1}