{"id":"07fc1100-8463-47f7-881e-df672b966aaf","arxiv_id":"2507.12076","paper_version":2,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":7,"one_line_summary":"In the diluted trillium-lattice compound K2FeSn(PO4)3, weak magnetic order at TN ≈ 2 K coexists with persistent, field-resilient spin dynamics in zero and 3.4 T fields.","lead":"K2FeSn(PO4)3, a S=5/2 trillium-lattice magnet with heavy iron/tin site dilution, shows weak magnetic order near 2 K that coexists with persistent spin fluctuations down to 30 mK. The experiments map a two-stage development of magnetic correlations and argue that the spin dynamics survive despite strong disorder, a step toward classical spin-liquid behavior in three-dimensional chiral lattices.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The central claim that KFSPO is a trillium-lattice spin-liquid candidate rests on the unverified assumption that the heavily diluted Fe sublattice still percolates; the paper explicitly states no percolation calculation exists and only asserts it as 'highly likely'.","rationale":"I read the abstract, the structure section, and the discussion carefully. The most load-bearing step is indeed the assumed percolation of the Fe sublattice. The authors themselves admit that no percolation threshold calculation exists for the trillium lattice, and they rely on a likelihood statement despite a ~44% occupancy on one of the two magnetic sublattices. If that connectivity assumption fails, the observed weak ordering and persistent muon relaxation could be explained by cluster physics or disorder-dominated magnetism rather than by the chiral trillium geometry. This concern does not invalidate the raw experimental observations, but it is essential for the interpretation. Because the same concern motivated the reader's conditional verdict, I see no reason to change that verdict.","tokens_in":19617,"tokens_out":3848,"duration_ms":42969,"concrete_test":"Run a site-percolation Monte Carlo study of the hypertrillium lattice using the published P213 structure and refined occupancies p1=0.44 (Fe1), p2=0.55 (Fe2), with bonds defined by the Fe1–Fe2 (4.96 Å) and Fe1–Fe1 (6.10 Å) distances. Compute the spanning-cluster probability and perform finite-size scaling for systems of at least 8×8×8 to 20×20×20 unit cells to estimate p_c and to test whether an infinite Fe cluster exists at the refined occupancies. If no spanning cluster is found, the load-bearing assumption of a percolating trillium network fails; if it percolates, the dilution concern is resolved.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The central claim—that KFSPO is a trillium-lattice spin-liquid candidate whose persistent spin dynamics reflect the hypertrillium topology—requires the heavily diluted Fe sublattice to form a percolating 3D network. The XRD refinement gives Fe1 44(3)% Fe and Fe2 55(3)% Fe (Section III.A). Section IV states: 'There is no direct calculation for the percolation threshold of a trillium lattice. It is highly likely that the Fe occupancy on the two interpenetrating trillium sublattices exceeds this threshold, thereby preserving long-range magnetic connectivity.' This is an unverified assumption, not a demonstrated result. On a bipartite Fe1–Fe2 hypertrillium graph, percolation requires both sublattices to be above their respective thresholds; a ~44% occupancy on one sublattice is not obviously above p_c for a 3D lattice. If the Fe network is fragmented, the observed weak order and persistent relaxation could arise from finite clusters or disorder-dominated correlations rather than from the chiral trillium geometry, directly undermining the interpretation. The paper's dismissal of a random-singlet scenario does not close this gap, because a sub-percolating diluted magnet need not show random-singlet power laws.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"This manuscript reports a combined thermodynamic, ESR, and muon-spin-rotation study of the S = 5/2 double trillium compound K2FeSn(PO4)3, in which the two magnetic Fe sites are heavily and randomly substituted by Sn (Fe1 44(3)% Fe, Fe2 55(3)% Fe). From susceptibility, specific heat, and ESR the authors identify a two-stage development of correlations across a crossover at T* approximately 11 K, and from dc and ac susceptibility a weak ordering transition at TN approximately 2 K that is suppressed by fields of about 2 T and accompanied by ZFC/FC splitting and a small hysteresis. Specific heat below 3 K follows Cmag = alpha T^n with n approximately 2.1 to 2.2, and no anomaly appears at TN. In muSR, zero-field spectra show no coherent oscillations and no 1/3 tail; down to 30 mK the relaxation is described by a two-component model combining a slowly relaxing exponential component and a fast Gaussian component, with relaxation rates that flatten below about 1 K and persist under a 3.4 T longitudinal field without full polarization recovery. The authors interpret the results as evidence of weak (possibly Dzyaloshinskii-Moriya-driven canted) magnetic order coexisting with persistent, field-resilient spin dynamics, and argue that the behavior reflects the hypertrillium lattice topology despite the heavy site dilution, while acknowledging that no percolation threshold for this lattice is known.","tokens_in":19885,"tokens_out":16282,"duration_ms":179839,"significance":"If the interpretation holds, KFSPO would be the highest-spin (S = 5/2) double trillium system in which weak magnetic order demonstrably coexists with persistent spin dynamics, extending the phenomenology established for K2Ni2(SO4)3 and KSrFe2(PO4)3 and supporting the robustness of the classical-spin-liquid scenario in three-dimensional chiral lattices. The experimental dataset is broad and internally consistent, the muSR data are openly archived, and the paper is commendably explicit about its own limitations, including the absence of a trillium-lattice percolation calculation and the need for neutron diffraction to pin down the ordered structure. The coexistence claim itself is defensible from the data: the ordering is supported by the susceptibility kink, ZFC/FC splitting, and hysteresis, and the persistent dynamics by the temperature- and field-independent muSR relaxation. The main vulnerability is interpretive: the topology-based narrative requires percolation of the diluted Fe network, which the paper asserts but does not establish, and the LF-decoupling logic contains a genuine internal slip that needs correction.","major_comments":[{"comment":"The central interpretation, that the persistent spin dynamics originate from the hypertrillium spin topology, requires the approximately 50% diluted Fe sublattice to form a percolating three-dimensional network. With Fe occupancies of 44(3)% (Fe1) and 55(3)% (Fe2), the probability that an Fe1-Fe2 exchange bond is magnetically active is p1 x p2 approximately 0.24, which falls in the range of typical three-dimensional bond-percolation thresholds; moreover, on the bipartite Fe1-Fe2 hypertrillium graph both sublattices must percolate. The statement in §IV that 'there is no direct calculation for the percolation threshold of a trillium lattice' and that percolation is 'highly likely' is therefore not a sufficient basis for the paper's headline claim, and it is reinforced by the contradicted assertion in §III.B that the dilution operates 'without introducing exchange randomness or quenched disorder' despite the acknowledged approximately 50% Fe/Sn randomness. I request a Monte Carlo site-percolation study of the hypertrillium lattice at the refined occupancies (probability of a percolating cluster, cluster-size statistics, and, if feasible, effective sublattice thresholds), or, failing that, a reframing of the abstract and conclusions in which the topological interpretation is presented as one of several disorder-compatible scenarios. The raw experimental claims do not depend on this calculation, but the title and abstract claims do.","section":"§IV (muSR decoupling argument)"},{"comment":"The decoupling argument as written states: 'if the Gaussian relaxation originates entirely from disorder-induced quasistatic moments, this should be reflected in our decoupling experiments as a saturation of the full polarization at fields 3.4 T > Delta/gamma_mu. Therefore, the absence of full recovery of muon spin polarization in LF-muSR experiments provides concrete evidence for disorder-induced smearing of the LRO state.' The second sentence draws the opposite conclusion from the premise of the first: the absence of full polarization recovery is evidence against a purely static, disorder-induced field distribution, and for the presence of dynamic fluctuations. As written, the passage cannot be parsed consistently, and it matters because the paper's claim that the muSR data exclude a trivial disorder origin rests on this step. Please rewrite the argument so that the direction of inference is explicit, and state separately (i) what the LF data rule out, namely a completely static local field distribution of width Delta/gamma_mu approximately 3 kG, and (ii) what they leave open, namely dynamically fluctuating disorder-dominated clusters as well as topology-driven spin-liquid fluctuations.","section":"§IV (muSR decoupling argument)"},{"comment":"The two-component muSR model involves several adjustable parameters (fZF, lambdaZF, sigmaZF and their LF analogues), and the physical assignment of the components is underdetermined: the approximately 18% exponential fraction is attributed to 'weakly ordered moments that remain dynamic' and the approximately 80% Gaussian fraction to 'strongly correlated magnets hosting spin singlet' excitations, with the undecouplable Gaussian further attributed to 'spin excitations (e.g., spinons)'. The LF data convincingly rule out a purely static local field distribution, but a distribution of fast-fluctuating clusters, a disorder-dominated state, would also evade static decoupling, so the observed absence of full polarization recovery does not by itself single out spinon-like excitations. The dismissal of the random-singlet scenario in §IV excludes only the specific power-law phenomenology (chi proportional to T^-alpha, Cmag/T proportional to T^-alpha, Delta H proportional to T^-alpha, lambda proportional to T^-alpha with 0 < alpha < 1); it does not exclude a fluctuating cluster state with different functional forms. I recommend either quantitative modeling that distinguishes these scenarios, for example an explicit comparison of the ZF and LF spectra against a distribution of relaxation rates, or a softened wording that presents the spinon interpretation as one of several possibilities consistent with persistent dynamics.","section":"§III.E; §IV"}],"minor_comments":[{"comment":"The sentence 'a distinct increase of fZF accompanied by a corresponding decrease of fZF' should read 'decrease of (1 - fZF)'.","section":"§III.E"},{"comment":"The random-singlet dismissal is stated twice in nearly identical consecutive sentences ('The absence of a similar power-law dependence in KFSPO indicates...' and 'The absence of a characteristic power-law dependence and its scaling in KFSPO suggests...'); one of the two should be deleted.","section":"§IV"},{"comment":"The temperature window over which Cmag = alpha T^n is fitted is never stated; please specify the fitting range in kelvin used to extract n and alpha for each field.","section":"§III.C"},{"comment":"The low-temperature Curie-Weiss regime below 66 K is quoted only through theta_CW = -30 K; the accompanying C and chi0 values and the fit range should be given so that the comparison with the high-temperature fit is complete.","section":"§III.B"},{"comment":"The estimate Delta/gamma_mu approximately 3 kG propagates the mean-field relation J = 3 k_B theta_CW / (2 z S (S+1)) with an assumed z = 6; since 3.4 T exceeds the estimate by an order of magnitude the decoupling conclusion is robust, but the text should label the underlying exchange estimate as order-of-magnitude.","section":"§III.E"},{"comment":"Although the absence of a muSR signature of TN is discussed, the estimated upper bound on the ordered moment consistent with the muSR spectra is not given; quoting such a bound, or stating that it cannot be reliably extracted, would strengthen the claim that the order is 'subtle'.","section":"§III.E; §IV"},{"comment":"Minor text corrections: 'stong magnetic interactions' in the Introduction, 'performend' in §II, 'titled compound' in §IV, 'expected 2.002(3)' for the free-electron g value in §III.D, and 'lambda LF (right x-axis)' in the Fig. 4 caption, which should read 'right y-axis'.","section":"Throughout"}],"recommendation":"major_revision","confidential_remarks":"The referee's main concern is that the interpretive claim in the title and abstract outruns the demonstrated percolation of the diluted Fe network; the requested Monte Carlo percolation calculation is modest and within the scope of a revision. If the authors cannot supply it, the claim of a trillium-topology-driven classical spin liquid should be downgraded to a disorder-compatible observation of coexisting weak order and persistent dynamics. No concerns about data provenance or citation practice; the comparison with isostructural compounds is appropriately framed, and the open archiving of the muSR data is a strength."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"Quick take: this is the first magnetic characterization of K2FeSn(PO4)3, and the multi-technique dataset is honestly collected and mostly transparent. The core observation—weak magnetic ordering near 2 K coexisting with persistent, field-resilient spin dynamics—is supported by the raw data: susceptibility kink, ZFC/FC splitting, small hysteresis, and muSR spectra with neither coherent oscillations nor a 1/3 tail. The muSR data are openly available, which earns credit.\n\nWhat is new is the compound, not the physics. The two-step correlation evolution (T* ~ 11 K) and the two-component muSR analysis closely follow the earlier K2CrTi(PO4)3 and K2Ni2(SO4)3 papers. That is fine—systematic characterization of a new family member is a legitimate contribution, and the comparison to those compounds is careful.\n\nThe soft spots are mostly interpretive. The percolation issue is real: Fe1 is only 44(3)% occupied and Fe2 55(3)%, and the paper admits there is no direct calculation of the trillium percolation threshold. \"Highly likely\" is doing a lot of work there. However, the coexistence claim itself does not collapse if the network is partially fragmented—the weak order and persistent dynamics would still be there, just attributed to cluster or disorder physics rather than the clean hypertrillium topology. So this is a caveat on the interpretation, not a fatal flaw. The dismissal of a random-singlet scenario also does not close the gap, because a sub-percolating diluted magnet need not show random-singlet power laws.\n\nMore bothersome is the garbled sentence in Section IV: \"the absence of full recovery of muon spin polarization in LF-µSR experiments provides concrete evidence for disorder-induced smearing of the LRO state\"—which reads as the opposite of what the surrounding argument claims. That needs fixing, and it makes the Discussion hard to follow exactly where the random-singlet alternative is being dismissed. The muSR model also has many adjustable parameters (two fractions plus two rates in both ZF and LF), and the undecouplable Gaussian at 3.4 T—far above the estimated ~3 kG local field—is interesting but speculative; calling it spinon-like evidence is a stretch without a concrete model. The absence of a specific-heat or muSR signature at TN is acknowledged and consistent with weak order, so I do not weight it heavily.\n\nThe paper is for workers on trillium and hypertrillium magnets and the broader frustrated-magnetism community. It deserves a serious referee: the data are solid, the questions are clear, and the remaining issues are fixable with a cleaner Discussion and, ideally, a percolation estimate. Send it to review.","headline":"Credible first magnetic characterization of a heavily diluted S=5/2 trillium compound showing weak order plus persistent spin dynamics, but the interpretation leans on an unverified percolation assumption and a garbled disorder discussion.","tokens_in":20535,"tokens_out":3519,"would_cite":true,"duration_ms":42886,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"A S=5/2 trillium magnet shows weak magnetic order coexisting with persistent, field-resistant spin dynamics.","keywords":["trillium lattice","hypertrillium lattice","geometrical frustration","classical spin liquid","muon spin relaxation","site dilution","weak ferromagnetism","S = 5/2"],"falsifier":"A single-crystal neutron diffraction experiment below 2 K could settle the central claim: if it shows fully static, long-range canted magnetic order with an ordered moment close to 5 μB and no broad diffuse or continuum scattering, then the coexistence picture would be contradicted. Conversely, mapping the Fe/Sn spatial distribution by resonant scattering or atomic-scale imaging would test the percolation assumption directly, since disconnected Fe clusters would invalidate the attribution of the dynamics to the hypertrillium topology.","tokens_in":19363,"feed_emoji":"🧲","tokens_out":7478,"duration_ms":87558,"temperature":0.7,"pith_summary":"This paper studies K2FeSn(PO4)3, a cubic chiral compound in which S=5/2 Fe3+ ions form a two-sublattice trillium network called a hypertrillium lattice. The central claim is that below a crossover at T*=11 K the material develops weak magnetic order near TN≈2 K, but that this order coexists with persistent, spin-liquid-like fluctuations down to at least 30 mK. The evidence comes from dc and ac susceptibility, specific heat, ESR, and muon spin relaxation measurements. If the interpretation is correct, KFSPO is a rare high-spin three-dimensional system whose ground state combines symmetry-breaking order with strong spin dynamics, supporting the idea that trillium topology alone can stabilize a classical spin-liquid-like regime.","feed_headline":"Weak order plus persistent spin motion in a 3D trillium magnet","feed_subtitle":"Muon and heat-capacity data show spin-liquid-like motion surviving weak order in K2FeSn(PO4)3.","key_machinery":"The central object is the hypertrillium lattice: two interpenetrating Fe3+ trillium sublattices linked by Fe1-Fe2 bonds of 4.96 Å to form a three-dimensional chiral network of corner-sharing tetrahedra in space group P213. This geometry is argued to survive Fe/Sn site dilution and to provide the degenerate spin manifold that sustains persistent dynamics. The argument is carried by muon spin relaxation with a two-component polarization function separating dynamic exponential relaxation from Gaussian quasistatic relaxation, by longitudinal-field decoupling that tests whether the quasistatic component is truly static, and by the low-temperature power-law specific heat Cmag≈αTn whose exponent n≈2.1-2.2 indicates gapless excitations. These probes together locate the system in an intermediate regime between static order and fast spin fluctuations.","core_discovery":"The paper's central claim is that K2FeSn(PO4)3, despite roughly 50% magnetic site dilution by nonmagnetic Sn, retains a percolating hypertrillium Fe network and exhibits a ground state in which weak magnetic order coexists with dominant persistent spin dynamics. The authors report a two-stage evolution of magnetic correlations across T*=11 K, inferred from ESR linewidth power laws and specific-heat features at TH≈25 K and TL≈6.3 K. Below TN≈2 K, susceptibility shows a weak kink and a ZFC-FC bifurcation with no frequency dependence in ac susceptibility, consistent with a weak canted ferromagnetic component likely arising from Dzyaloshinskii-Moriya interactions in the non-centrosymmetric chiral space group. Muon spin relaxation shows neither coherent oscillations nor a conventional 1/3 spin-freezing tail, and requires both an exponential dynamic component and a Gaussian quasistatic component, with the quasistatic fraction remaining undecouplable even in a 3.4 T longitudinal field. The authors interpret this as evidence that dynamically fluctuating spins coexist with weak quasistatic local fields, and they contrast the behavior with random-singlet and conventional spin-glass scenarios.","pith_inferences":["Editorial inference: If Fe/Sn occupancy is truly above the percolation threshold, a dilution series varying the Fe:Sn ratio should interpolate between percolating hypertrillium behavior and cluster-dominated behavior; observing that crossover would provide a direct test of the topology-based explanation.","Editorial inference: The paper's own admission that no trillium-lattice percolation threshold has been calculated leaves a concrete missing check: a site-percolation simulation of the hypertrillium lattice at about 50% Fe occupancy would settle whether the observed ground state can be attributed to the clean trillium topology.","Editorial inference: Because the muon sample contained both enantiomers of the chiral crystal, any handedness-specific signatures are averaged; growing or selecting single-enantiomer crystals could reveal whether the persistent dynamics or weak order differ between mirror twins.","Editorial inference: The undecouplable Gaussian muSR component suggests that the 'quasistatic' fraction is not frozen on the muon timescale but may fluctuate on longer timescales; extending measurements to longer time windows or adding NMR would clarify whether the weak order is truly static."],"forward_implications":["If KFSPO behaves as reported, it becomes a benchmark S=5/2 case where spin-liquid-like fluctuations survive a weak ordering transition, showing that classical spin-liquid physics can be realized in three dimensions without strong quantum fluctuations.","Fields above about 2 T suppress the weak canted order while leaving persistent muon relaxation, implying that the weak order and the spin dynamics can be field-separated.","The absence of a 1/3 magnetization plateau up to 55 T distinguishes the hypertrillium lattice from the single-trillium classical spin-liquid candidate Na[Mn(HCOO)3] and implies additional exchange interactions beyond the nearest-neighbor Heisenberg model.","The near-quadratic low-temperature specific heat, interpreted as evidence of local spin singlets, connects the high-spin 3D trillium behavior to kagome-like spin-liquid phenomenology.","Comparison with the sister compound KSrFe2(PO4)3 suggests that magnetic site dilution mainly affects weak ferromagnetic interactions while leaving the spin dynamics of the trillium topology largely intact."],"supporting_citations":[{"why":"Supplies the crystal structure and Fe/Sn site occupancies that define the hypertrillium network.","marker":"[53]"},{"why":"Provides the key comparison for persistent spin dynamics and the undecouplable Gaussian muSR relaxation in a trillium compound.","marker":"[38]"},{"why":"Isostructural sister compound showing Dzyaloshinskii-Moriya-driven weak ferromagnetism and two-step ESR linewidth evolution.","marker":"[43]"},{"why":"S=5/2 trillium compound with spin-liquid-like signatures used to separate the effects of magnetic versus nonmagnetic site disorder.","marker":"[40]"},{"why":"Single-trillium classical spin-liquid candidate whose 1/3 magnetization plateau is absent in KFSPO.","marker":"[52]"},{"why":"Trillium compound where Dzyaloshinskii-Moriya interactions and subdominant ferromagnetic exchange are discussed.","marker":"[45]"},{"why":"MuSR study of a kagome spin-liquid candidate showing persistent spin dynamics and the undecouplable Gaussian relaxation signature.","marker":"[70]"},{"why":"Specific-heat study connecting near-quadratic temperature dependence to local spin singlets in a frustrated magnet.","marker":"[62]"}],"fun_headline_variants":["Weak order, persistent spin motion in chiral trillium","Spin dynamics persist beneath weak order in trillium magnet","Muons reveal unbroken spin motion in weakly ordered trillium","Classical spin liquid hints in high-spin trillium magnet","Weak order but no spin freezing in trillium magnet"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The whole interpretation rests on the Fe3+ ions remaining connected into a three-dimensional hypertrillium network despite roughly half of the magnetic sites being replaced by nonmagnetic Sn4+; the paper states that no direct percolation-threshold calculation for the trillium lattice exists, so the topology argument depends on the unproven assumption that the Fe occupancy lies above that threshold.","fun_headline_variants_meta":{"raw":{"variants":["Weak order, persistent spin motion in chiral trillium","Spin dynamics persist beneath weak order in trillium magnet","Muons reveal unbroken spin motion in weakly ordered trillium","Classical spin liquid hints in high-spin trillium magnet","Weak order but no spin freezing in trillium magnet"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.00064,"raw_usage":{"total_tokens":3008,"prompt_tokens":1066,"completion_tokens":1942,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":682,"completion_tokens_details":{"reasoning_tokens":1857}},"tokens_in":682,"tokens_out":1942,"duration_ms":17150,"temperature":1.0,"reasoning_tokens":1857,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-06T16:54:31.409784+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A single-crystal neutron diffraction experiment below 2 K could settle the central claim: if it shows fully static, long-range canted magnetic order with an ordered moment close to 5 μB and no broad diffuse or continuum scattering, then the coexistence picture would be contradicted. Conversely, mapping the Fe/Sn spatial distribution by resonant scattering or atomic-scale imaging would test the percolation assumption directly, since disconnected Fe clusters would invalidate the attribution of the dynamics to the hypertrillium topology.","supporting_citations":[{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Supplies the crystal structure and Fe/Sn site occupancies that define the hypertrillium network."},{"cited_title":"ˇZivkovi´ c, V","cited_arxiv_id":null,"evidence_quote":"Provides the key comparison for persistent spin dynamics and the undecouplable Gaussian muSR relaxation in a trillium compound."},{"cited_title":"Khatua, S","cited_arxiv_id":null,"evidence_quote":"Isostructural sister compound showing Dzyaloshinskii-Moriya-driven weak ferromagnetism and two-step ESR linewidth evolution."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"S=5/2 trillium compound with spin-liquid-like signatures used to separate the effects of magnetic versus nonmagnetic site disorder."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Single-trillium classical spin-liquid candidate whose 1/3 magnetization plateau is absent in KFSPO."},{"cited_title":"Kub´ ıˇ ckov´ a, A","cited_arxiv_id":null,"evidence_quote":"Trillium compound where Dzyaloshinskii-Moriya interactions and subdominant ferromagnetic exchange are discussed."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"MuSR study of a kagome spin-liquid candidate showing persistent spin dynamics and the undecouplable Gaussian relaxation signature."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Specific-heat study connecting near-quadratic temperature dependence to local spin singlets in a frustrated magnet."}],"review_version":1}