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arxiv: 2604.15608 · v1 · submitted 2026-04-17 · ❄️ cond-mat.str-el

Inelastic neutron scattering study on the AFM uniform spin-1/2 chain compound CuSb2O6

Masashi Hasea , Minoru Soda , Takatsugu Masuda , Shinichi Itoh , Tetsuya Yokoo This is my paper

Pith reviewed 2026-05-10 08:25 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords inelastic neutron scatteringCuSb2O6spin-1/2 chainXXZ modelantiferromagnetismIsing anisotropymagnetic excitations
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The pith

The 1.8 meV gap in CuSb2O6 arises from small Ising anisotropy in its uniform XXZ spin-1/2 chain.

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

The paper reports inelastic neutron scattering on powdered CuSb2O6, showing magnetic excitations from 1.8 to 13 meV at 2.5 K below the antiferromagnetic transition at TN = 8.7 K. These excitations are gapped at low temperature but become gapless above TN, indicating that anisotropy rather than magnetic ordering opens the gap. The data fit the antiferromagnetic uniform XXZ chain model with exchange Jab = 6.437 meV and anisotropy DJab = 0.063 meV. The ratio DJab/Jab = 0.0098 accounts for the 1.8 meV gap, and the intensity peaks at the wavevector tied to the strongest Cu-Cu interaction distance of 0.65562 nm. A sympathetic reader would care because the work gives a quantitative microscopic picture of one-dimensional magnetism in this material and links the gap directly to a small Ising term.

Core claim

The magnetic excitations observed in inelastic neutron scattering on CuSb2O6 can be explained by the AFM uniform XXZ chain with Jab = 6.437 meV and DJab = 0.063 meV. The 1.8 meV gap is caused by the small Ising anisotropy with DJab/Jab = 0.0098. The gap excitations are strongest at a momentum transfer corresponding to the Cu pair length of 0.65562 nm where the Jab interaction is the strongest, and the gap closes above the Néel temperature.

What carries the argument

The AFM uniform XXZ chain model, which uses the isotropic antiferromagnetic exchange Jab along the chain and the Ising anisotropy term DJab to generate the gapped spin-wave spectrum.

If this is right

  • The gap is expected to close above TN = 8.7 K, producing gapless excitations at higher temperatures.
  • The intensity of the gap excitations reaches a maximum at the wavevector corresponding to the dominant Jab interaction at 0.65562 nm.
  • The gap value of 1.8 meV should agree with the independent estimate of 1.51 meV from specific heat data.
  • The small anisotropy ratio DJab/Jab = 0.0098 implies the system is close to the isotropic Heisenberg limit.

Where Pith is reading between the lines

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

  • If interchain couplings are negligible, the model predicts that an external magnetic field would split or close the gap in a manner consistent with the XXZ dispersion.
  • Related chain compounds could be examined to see how small structural changes alter the anisotropy ratio DJab/Jab.
  • The description suggests that magnetization or ESR measurements could independently confirm the anisotropy strength without relying on neutron scattering.

Load-bearing premise

The observed excitations arise exclusively from the uniform spin-1/2 XXZ chain without significant contributions from interchain couplings, impurities, or other magnetic interactions.

What would settle it

A measurement on a single crystal showing multiple dispersion branches, a gap that remains open above 8.7 K, or intensity peaks at wavevectors inconsistent with the 0.65562 nm Cu-Cu distance would indicate the uniform XXZ chain model is incomplete.

Figures

Figures reproduced from arXiv: 2604.15608 by Masashi Hasea, Minoru Soda, Shinichi Itoh, Takatsugu Masuda, Tetsuya Yokoo.

Figure 1
Figure 1. Figure 1: (a)–(b) The crystal structure of CuSb2O6 [15, 16], as drawn using VESTA [19]. The space group is monoclinic P21/n (No. 14), and the lattice constants are a = 4.6349(1) Å, b = 4.6370(1) Å, c = 9.2931(10) Å, and β = 91.124(2)◦ at room temperature. We use P21/n in this paper because it is the most commonly used space group for CuSb2O6 in related papers. In the standard notation, space group No. 14 is expresse… view at source ↗
Figure 2
Figure 2. Figure 2: The INS intensity I(Q, ω) maps of CuSb2O6 powder. The measurement tem￾perature is 2.5 K for (a) and (b) and 12.5 K for (c) and (d). Ei is 11.4 meV for (a) and (c) and 51.0 meV for (b) and (d). The solid line in (a) and (b) shows the dispersion relation along the chain direction of the AFM uniform XXZ chain with Jab = 6.437 meV and ∆Jab = 0.063 meV. The vertical key on the right shows the INS intensity in a… view at source ↗
read the original abstract

We carried out inelastic neutron scattering experiments on a powdered sample of the antiferromagnetic (AFM) uniform spin-1/2 chain compound CuSb2O6.The magnetic excitations appear in the energy range of 1.8 to 13 meV at 2.5 K below the AFM transition temperature (TN = 8.7 K).The gap value (1.8 meV) is close to that evaluated from the specific heat (1.51 meV). The excitations at 12.5 K (> TN) appear gapless. Thus, the 1.8 meV gap is caused by some anisotropy in spin-wave excitations. The gap excitations are strongest at 0.48 corresponding to a length of 0.66 nm. This result is consistent with the theoretical one that the interaction in a Cu pair with a length of 0.65562 nm (Jab) is strongest. The magnetic excitations can be explained by the AFM uniform XXZ chain with Jab = 6.437 meV and DJab = 0.063 meV. The 1.8 meV gap is caused by the small Ising anisotropy (DJab/Jab = 0.0098).

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.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The central claim rests on two fitted parameters and the assumption that the material realizes an ideal uniform spin-1/2 XXZ chain.

free parameters (2)
  • Jab = 6.437 meV
    Main antiferromagnetic exchange interaction fitted to the observed excitation energies.
  • DJab = 0.063 meV
    Ising anisotropy term fitted to open the observed 1.8 meV gap.
axioms (1)
  • domain assumption The magnetic interactions in CuSb2O6 are accurately described by a uniform spin-1/2 XXZ chain Hamiltonian.
    Invoked to interpret the entire excitation spectrum and to assign the gap to the anisotropy term.

pith-pipeline@v0.9.0 · 5540 in / 1428 out tokens · 45108 ms · 2026-05-10T08:25:58.296025+00:00 · methodology

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Reference graph

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