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arxiv: 2604.19376 · v1 · submitted 2026-04-21 · ❄️ cond-mat.str-el

Field-induced antiferromagnetic transition in CeIrIn₅

Pith reviewed 2026-05-10 01:38 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords CeIrIn5NMRheavy fermionantiferromagnetic transitionfield-induced ordernuclear relaxationhigh magnetic field
0
0 comments X

The pith

High magnetic fields near the c axis drive CeIrIn5 into an antiferromagnetic state with moments aligned along the c axis.

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

The paper reports low-temperature 115In NMR measurements on the heavy-fermion compound CeIrIn5 in magnetic fields oriented close to the crystallographic c axis. At a field of about 28 T the NMR line intensity collapses because the transverse relaxation time T2 shortens dramatically, while the spin-lattice relaxation rate 1/T1 reaches a sharp maximum. These features are interpreted, together with earlier de Haas-van Alphen data and band-structure calculations, as the onset of long-range antiferromagnetic order with propagation vector Q = (1/2, 1/2, 0) and moments pointing antiferromagnetically along the c direction. A sympathetic reader would care because the result identifies a concrete microscopic mechanism by which an external field can stabilize magnetic order with moments parallel to itself, a configuration rarely seen in heavy-fermion systems.

Core claim

Our NMR results are most naturally explained by the field-induced transition into an antiferromagnetic state with the propagation vector Q = (1/2, 1/2, 0) and magnetic moments aligned antiferromagnetically along the c axis. This makes CeIrIn5 a unique case where the application of the magnetic field induces an ordered state with moments antiferromagnetically aligned along the field direction.

What carries the argument

The field-induced antiferromagnetic transition with propagation vector Q = (1/2, 1/2, 0) and moments aligned antiferromagnetically along the c axis, detected through the sudden shortening of NMR T2 (loss of signal intensity) and the peak in 1/T1 at 28 T.

If this is right

  • The transition field of approximately 28 T marks the boundary to this specific antiferromagnetic state when the field is applied near the c axis.
  • Magnetic moments order antiferromagnetically along the c axis even though the external field points along the same direction.
  • The NMR spectrum itself shows no splitting or shift, only relaxation changes, consistent with the proposed moment arrangement.
  • The interpretation is reinforced by consistency with prior de Haas-van Alphen frequencies and band-structure calculations.

Where Pith is reading between the lines

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

  • The field may enhance Fermi-surface nesting at Q = (1/2, 1/2, 0), thereby stabilizing the antiferromagnetic order.
  • The same mechanism could appear in related tetragonal heavy-fermion compounds when the field is aligned with the easy magnetization axis.
  • Absence of spectral broadening suggests the hyperfine fields at indium sites average to zero or remain small in the ordered state.

Load-bearing premise

The observed drop in NMR intensity and peak in 1/T1 are produced by the onset of long-range antiferromagnetic order with the stated Q vector and moment direction rather than by other changes in spin dynamics or electronic structure.

What would settle it

Neutron diffraction that detects (or fails to detect) magnetic Bragg peaks at Q = (1/2, 1/2, 0) with moments along the c axis above 28 T would confirm or refute the antiferromagnetic interpretation.

Figures

Figures reproduced from arXiv: 2604.19376 by D. Aoki, H. Harima, H. Sakai, I. Sheikin, M. Horvati\'c, M.-T. Suzuki, S. Kambe, S. Kr\"amer, Y. Tokunaga.

Figure 3
Figure 3. Figure 3: FIG. 3. (a) Field-swept [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) Field-swept [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) Field dependence of the Knight shift for In(1) and [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Calculated major FSs in the paramagnetic state of [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
read the original abstract

We report low-temperature $^{115}$In nuclear magnetic resonance (NMR) study of the prototypical heavy-fermion compound CeIrIn$_5$ in high magnetic fields applied close to the crystallographic $c$ axis. For this orientation, a field-induced transition was previously reported to take place at about 28 T. Although we do not observe any change of the NMR spectrum above the transition, the intensity of the NMR lines drastically decreases as a consequence of a considerable shortening of the $T_2$ relaxation time. In addition, $1/T_1$ shows a pronounced maximum at the transition. Taking into account previous high-field de Haas-van Alphen results in conjunction with band-structure calculations, our NMR results are most naturally explained by the field-induced transition into an antiferromagnetic state with the propagation vector $\mathbf{Q} = (1/2, 1/2, 0)$ and magnetic moments aligned antiferromagnetically along the $c$ axis. This makes CeIrIn$_5$ a unique case where the application of the magnetic field induces an ordered state with moments antiferromagnetically aligned along the field direction.

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

3 major / 1 minor

Summary. The manuscript reports 115In NMR measurements on CeIrIn5 in high magnetic fields near the c axis. It documents a field-induced transition near 28 T via a sharp drop in NMR line intensity caused by shortened T2, a peak in 1/T1, and no detectable change in resonance positions or widths. The authors interpret these signatures, combined with prior dHvA data and band-structure calculations, as evidence for a transition into an antiferromagnetic state with propagation vector Q = (1/2, 1/2, 0) and moments aligned antiferromagnetically along the c axis, making this a unique case of field-induced order with moments parallel to the field.

Significance. If substantiated, the result would be significant as a rare demonstration of field-induced antiferromagnetism in a heavy-fermion compound where ordered moments align parallel to the applied field. This could constrain models of field-tuned quantum criticality and the competition between Kondo screening and RKKY interactions in CeIrIn5 and related materials. The raw experimental signatures (T2 shortening and 1/T1 maximum without spectral shift) are clearly documented.

major comments (3)
  1. [Abstract and interpretation section] Abstract and interpretation section: The claim that the NMR results are 'most naturally explained' by long-range AF order with the specific Q = (1/2, 1/2, 0) and c-axis moments rests on external dHvA and calculations rather than being extracted from the spectra or relaxation rates. The data (unchanged resonance positions/widths, T2-induced intensity loss, 1/T1 peak) are compatible with critical fluctuations or electronic reconstruction at any transition; no quantitative model is provided showing that only this structure reproduces the observations while alternatives (incommensurate order, short-range correlations, or non-magnetic Lifshitz transition) do not.
  2. [Results section] Results section: The absence of any NMR spectral change is noted but not reconciled in detail with static long-range AF order. Finite c-axis moments on the proposed structure would generally produce internal hyperfine fields leading to line splitting or broadening at the In sites unless precise cancellation occurs; the manuscript should supply a site-specific calculation or argument demonstrating why this Q and moment direction leaves the spectrum unshifted while still causing the observed T2 shortening.
  3. [Discussion] Discussion: The 1/T1 maximum is presented as a signature of the transition, but the text does not distinguish whether it arises from critical slowing down at a magnetic ordering transition versus other spin dynamics or density-of-states changes. A minimal model or comparison to expected behavior for the proposed AF state versus non-magnetic scenarios would strengthen the specificity of the interpretation.
minor comments (1)
  1. [Abstract] The abstract could quantify the intensity drop (e.g., by what factor) and the field precision of the c-axis alignment to aid reproducibility.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on our manuscript. We address each major comment below and have revised the manuscript to improve clarity on the interpretation, provide additional arguments for the lack of spectral changes, and better distinguish the relaxation signatures.

read point-by-point responses
  1. Referee: Abstract and interpretation section: The claim that the NMR results are 'most naturally explained' by long-range AF order with the specific Q = (1/2, 1/2, 0) and c-axis moments rests on external dHvA and calculations rather than being extracted from the spectra or relaxation rates. The data (unchanged resonance positions/widths, T2-induced intensity loss, 1/T1 peak) are compatible with critical fluctuations or electronic reconstruction at any transition; no quantitative model is provided showing that only this structure reproduces the observations while alternatives (incommensurate order, short-range correlations, or non-magnetic Lifshitz transition) do not.

    Authors: We agree that the specific Q vector and moment direction are inferred from combining our NMR data with prior dHvA results and band-structure calculations, rather than being uniquely determined by the NMR spectra alone. The NMR measurements establish the presence of a transition through the T2 shortening (indicating static local fields or strong low-frequency components) and 1/T1 peak, but the detailed structure relies on the external information. We have revised the abstract and interpretation section to state this dependence more explicitly and to note that while alternatives cannot be fully excluded without additional data, the proposed antiferromagnetic order is the most consistent with the full body of experimental and theoretical results available for CeIrIn5. revision: partial

  2. Referee: Results section: The absence of any NMR spectral change is noted but not reconciled in detail with static long-range AF order. Finite c-axis moments on the proposed structure would generally produce internal hyperfine fields leading to line splitting or broadening at the In sites unless precise cancellation occurs; the manuscript should supply a site-specific calculation or argument demonstrating why this Q and moment direction leaves the spectrum unshifted while still causing the observed T2 shortening.

    Authors: We have added a symmetry-based argument in the revised results section. For the Q = (1/2, 1/2, 0) structure with moments aligned antiferromagnetically along the c axis, the local hyperfine fields at the In(1) and In(2) sites cancel due to the tetragonal crystal symmetry and the relative positions of the indium atoms with respect to the ordered Ce moments. This cancellation accounts for the absence of observable shifts or broadening. The T2 shortening is still expected from the development of static moments, which enhance spin-spin interactions and low-frequency fluctuations. A full numerical site-by-site calculation would require detailed hyperfine tensor parameters that are not fully available in the literature, but the symmetry argument is sufficient to reconcile the observations. revision: yes

  3. Referee: Discussion: The 1/T1 maximum is presented as a signature of the transition, but the text does not distinguish whether it arises from critical slowing down at a magnetic ordering transition versus other spin dynamics or density-of-states changes. A minimal model or comparison to expected behavior for the proposed AF state versus non-magnetic scenarios would strengthen the specificity of the interpretation.

    Authors: We have expanded the discussion to include a comparison. The simultaneous presence of a pronounced 1/T1 peak and strong T2 shortening is characteristic of critical slowing down associated with magnetic ordering, where low-frequency spin fluctuations become dominant. In contrast, a non-magnetic Lifshitz transition would primarily alter the electronic density of states and the Korringa relaxation rate without producing the observed transverse relaxation effects indicative of static or quasi-static local fields. This combination of signatures supports the magnetic character of the transition over purely electronic reconstructions. revision: yes

Circularity Check

0 steps flagged

No circularity: NMR observations interpreted with external prior dHvA and band calculations

full rationale

The paper reports independent NMR data (unchanged resonance positions, intensity drop from shortened T2, 1/T1 peak at ~28 T) and states that these are 'most naturally explained by' a specific AF state with Q = (1/2, 1/2, 0) and moments along c only after 'taking into account previous high-field de Haas-van Alphen results in conjunction with band-structure calculations.' No equations, ansatzes, or fitted parameters are defined in terms of the target quantities. The propagation vector and moment direction are imported from cited external experiments and calculations rather than derived or fitted from the present NMR spectra. This is standard interpretive use of prior literature; the central claim does not reduce to its inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on the applicability of standard NMR relaxation theory to probe magnetic ordering and on the accuracy of previously published band-structure calculations for the Fermi surface. No new free parameters are introduced in the abstract, and the antiferromagnetic state is inferred from data rather than postulated without evidence.

axioms (2)
  • standard math Nuclear magnetic resonance relaxation rates (T1 and T2) are sensitive to local magnetic fluctuations and can detect the onset of long-range order.
    This is a standard assumption of NMR spectroscopy in condensed-matter systems.
  • domain assumption Band-structure calculations and de Haas-van Alphen data provide a reliable guide to possible magnetic propagation vectors in CeIrIn5.
    The abstract explicitly invokes these prior results to select Q = (1/2, 1/2, 0).

pith-pipeline@v0.9.0 · 5535 in / 1748 out tokens · 61136 ms · 2026-05-10T01:38:00.718889+00:00 · methodology

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