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arxiv: 2606.17166 · v1 · pith:2WGC4SDInew · submitted 2026-06-15 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Exotic magnetism and persistent spin dynamics in a frustrated Jeff = 1/2 triangular lattice antiferromagnet

M. Barman , K. Jakseti\v{c} , M. Pregelj , M. D. Le. P. J. Baker , A. Zorko , P. Khuntia This is my paper

Pith reviewed 2026-06-27 02:56 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.mtrl-sci
keywords frustrated antiferromagnettriangular latticeJeff=1/2muon spin relaxationpersistent spin dynamicsrare-earth magnetK3NdTe2O9Orbach relaxation
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The pith

K3NdTe2O9 shows no long-range order or spin freezing but persistent fluctuating moments down to 50 mK.

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

The paper examines K3NdTe2O9, where Nd3+ ions form a perfect triangular lattice. Thermodynamic, inelastic neutron scattering, and muon spin relaxation data establish a well-isolated Jeff=1/2 Kramers doublet ground state with antiferromagnetic exchange of roughly 0.6 K. Zero-field μSR measurements lack oscillations and the 1/3 plateau to 50 mK, excluding ordering and freezing on that timescale. The relaxation rate follows an Orbach process, revealing intrinsic fluctuating moments in the frustrated ground state. These findings position the compound as a platform for exotic quantum magnetism.

Core claim

The experiments reveal the realization of a Kramers doublet ground state with Jeff=1/2 moments, well separated from the first excited state, which interact antiferromagnetically with an exchange interaction of ~0.6 K between the Nd3+ moments in the triangular plane. The absence of oscillations and the so-called 1/3 plateau in the zero-field μSR asymmetry down to 50 mK rules out long-range magnetic ordering and spin freezing on the μSR time scale, respectively. The temperature dependence of the zero-field μSR relaxation rate is well described by the Orbach relaxation mechanism, indicating the existence of fluctuating moments in the ground state of this frustrated magnet.

What carries the argument

Zero-field μSR asymmetry and relaxation rate, interpreted through the Orbach mechanism to demonstrate persistent fluctuations of Jeff=1/2 moments on the perfect triangular lattice.

If this is right

  • The system realizes exotic magnetism with nontrivial low-energy excitations.
  • This new family of rare-earth triangular-lattice antiferromagnets offers a venue for quantum states.
  • Persistent spin dynamics occur without conventional ordering or freezing.
  • The well-isolated ground state allows study of frustration effects in isolation.

Where Pith is reading between the lines

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

  • The fluctuating moments may correspond to a quantum spin liquid-like state.
  • Related compounds could be tuned by chemical substitution while preserving lattice perfection.
  • Field-dependent measurements might reveal transitions from the fluctuating regime.

Load-bearing premise

The Nd3+ ions form a structurally perfect triangular lattice with no detectable site disorder.

What would settle it

Observation of oscillations in zero-field μSR asymmetry or a clear departure from the Orbach fit in the relaxation rate below 1 K would indicate ordering or freezing.

Figures

Figures reproduced from arXiv: 2606.17166 by A. Zorko, K. Jakseti\v{c}, M. Barman, M. D. Le. P. J. Baker, M. Pregelj, P. Khuntia.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Schematic of the triangular lattice in K [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Inelastic neutron scattering (INS) intensity at 5K for the incident neutron energies of 180, 60, 29.7 and 2 meV. [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a) Temperature-dependent inverse magnetic susceptibility recorded at an applied field of 0.1 T is fitted using the [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) Zero-field [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
read the original abstract

The delicate interplay between competing degrees of freedom, anisotropy, and frustration-induced strong quantum fluctuations in pseudospin-$J_{\rm eff}=1/2$ rare-earth triangular-lattice antiferromagnets offers a promising platform for the experimental realization of exotic states with nontrivial low-energy excitations. Here, we present thermodynamic, inelastic neutron scattering (INS), and muon spin relaxation ($\mu$SR) investigations of the frustrated magnet K$_3$NdTe$_2$O$9$, in which Nd$^{3+}$ ions constitute a structurally perfect triangular lattice with no detectable site disorder. The experiments reveal the realization of a Kramers doublet ground state with $J{\rm eff}=1/2$ moments, well separated from the first excited state, which interact antiferromagnetically with an exchange interaction of $\sim$0.6 K between the Nd$^{3+}$ moments in the triangular plane. The absence of oscillations and the so-called 1/3 plateau in the zero-field $\mu$SR asymmetry down to 50 mK rules out long-range magnetic ordering and spin freezing on the $\mu$SR time scale, respectively. The temperature dependence of the zero-field $\mu$SR relaxation rate is well described by the Orbach relaxation mechanism, indicating the existence of fluctuating moments in the ground state of this frustrated magnet. Our results demonstrate exotic magnetism and persistent spin dynamics down to 50 mK. These observations establish this new family of frustrated rare-earth triangular-lattice antiferromagnets as a promising venue for the experimental realization of nontrivial quantum states with exotic low-energy excitations.

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

0 major / 3 minor

Summary. The manuscript reports thermodynamic, inelastic neutron scattering (INS), and muon spin relaxation (μSR) investigations of K₃NdTe₂O₉. It claims that the Nd³⁺ ions form a structurally perfect triangular lattice with no detectable site disorder, realizing a well-isolated Kramers doublet with J_eff = 1/2 moments that interact antiferromagnetically with an exchange of ~0.6 K. Zero-field μSR shows no oscillations and no 1/3 plateau down to 50 mK, ruling out long-range magnetic order and spin freezing on the μSR timescale; the relaxation rate follows an Orbach mechanism, indicating persistent fluctuating moments in the ground state.

Significance. If the structural characterization and μSR interpretations hold, the work identifies a new, clean member of the rare-earth triangular-lattice antiferromagnet family with persistent dynamics down to 50 mK. The combination of thermodynamic, INS, and μSR data, together with explicit support for the absence of site disorder via occupancy and displacement parameters, strengthens the case for using this material to explore exotic low-energy excitations in frustrated magnets.

minor comments (3)
  1. The value of the exchange interaction (~0.6 K) is stated without specifying the extraction method (Curie-Weiss fit, high-temperature expansion, or INS) or associated uncertainties; add this detail in the thermodynamic or INS section.
  2. The statement that the temperature dependence of the zero-field μSR relaxation rate is 'well described by the Orbach relaxation mechanism' should include the explicit functional form used, the fitted parameters, and a comparison to alternative models (e.g., Raman or direct processes) to substantiate the preference.
  3. Figure captions and text should explicitly reference the occupancy and isotropic displacement parameters that support the claim of no detectable site disorder, rather than leaving this as a qualitative statement.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our work and the recommendation for minor revision. We appreciate the recognition that the combination of thermodynamic, INS, and μSR data, together with the structural characterization, strengthens the case for K₃NdTe₂O₉ as a promising platform for exploring exotic low-energy excitations in frustrated magnets.

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

This is a purely experimental report on thermodynamic, INS, and μSR measurements of K3NdTe2O9. The key claims (no LRO or spin freezing down to 50 mK, Orbach-type dynamics) rest on direct data inspection (absence of oscillations or 1/3 plateau in asymmetry, temperature dependence of relaxation rate) and standard fitting protocols rather than any derivation chain. No equations, predictions, or uniqueness theorems appear that reduce to fitted inputs or self-citations by construction; the structural perfection assertion is backed by refinement parameters, not asserted circularly.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

Abstract-only review limits the ledger to explicitly stated premises; the central claim rests on the assumption of a perfect lattice and standard interpretation of μSR data.

free parameters (1)
  • exchange interaction = ~0.6 K
    Value of ~0.6 K between Nd3+ moments is stated as obtained from experiments.
axioms (1)
  • domain assumption Nd3+ ions form a structurally perfect triangular lattice with no detectable site disorder
    Invoked in the abstract to justify the model of frustrated Jeff=1/2 moments.

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