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arxiv: 2605.20020 · v1 · pith:2H2U6ZFAnew · submitted 2026-05-19 · ❄️ cond-mat.str-el

Tunable magnetotransport through kinetically hindered first-order phase transitions in an antiferromagnetic metal

Pith reviewed 2026-05-20 04:02 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords CeCoGe3antiferromagnetic metalfirst-order phase transitionmagnetic glassmultilevel resistancemagnetotransportkinetically hindered transitionnon-centrosymmetric
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The pith

Cooling CeCoGe3 through a kinetically hindered first-order magnetic transition in an applied field produces a magnetic glass state with field-tunable multilevel resistance.

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

The paper shows that the antiferromagnetic metal CeCoGe3 can host stable multilevel resistive states by using a kinetically hindered first-order magnetic transition. Cooling the material through this transition while a magnetic field is applied creates a magnetic glass in which high- and low-temperature phases coexist. The cooling field sets the relative volume fraction of the two phases, and the electrical resistance directly tracks that fraction. Once the sample is cooled, the resistance levels remain stable even if the field is later removed. This mechanism supplies a concrete materials route toward controllable multilevel magnetoresistance for memory applications.

Core claim

Cooling through the kinetically hindered first-order transition in an applied magnetic field produces a magnetic glass state in which high- and low-temperature magnetic phases coexist. The relative fraction of these phases can be controlled by the applied field in which the sample is cooled, and the electrical resistance is directly sensitive to that fraction. As a result, CeCoGe3 supports stable multilevel resistive states.

What carries the argument

The magnetic glass state arising from a kinetically hindered first-order antiferromagnetic transition, whose phase fraction is locked by the cooling magnetic field and read out by resistance.

If this is right

  • Different cooling fields produce multiple distinct, non-volatile resistance values that can be selected and read at zero field.
  • The resistance of the mixed state directly encodes the volume fraction of the coexisting magnetic phases.
  • The multilevel states persist after the cooling field is removed, enabling field-programmed memory elements.
  • Kinetically hindered first-order transitions become a design principle for achieving tunable magnetotransport in other antiferromagnetic metals.

Where Pith is reading between the lines

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

  • The same cooling-field protocol could be applied to other non-centrosymmetric materials that show similar kinetic hindrance, potentially broadening the range of available multilevel resistive platforms.
  • Resistance measurements in this regime might serve as a bulk probe of hidden phase coexistence that is complementary to local microscopy.
  • If the phase fractions can be set continuously rather than in discrete steps, the material could support analog-like resistance values useful for neuromorphic hardware.

Load-bearing premise

The coexisting magnetic phases remain fixed in their volume fractions after field cooling, and the measured resistance stably reflects those fractions without relaxation or other contributions.

What would settle it

A time-dependent drift in resistance at fixed low temperature and zero field after different cooling-field protocols, or identical resistance values obtained from cooling paths that should produce different phase fractions.

Figures

Figures reproduced from arXiv: 2605.20020 by Connor J. Pollak, Grigorii Skorupskii, Jaime M. Moya, Leslie M. Schoop, Nitish Mathur, Scott B. Lee, Sudipta Chatterjee.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: a (dark line). This curve was compared to a ref￾erence “no pause” curve measured after uninterrupted cooling (Fig. 3a, light line). No discernible difference is observed between the two curves, indicating no measur￾able memory effect under these ZFC conditions. Because strong magnetic fields can suppress memory signatures in spin- or cluster-glass systems, analogous measurements were performed in a 0.01 T … view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
read the original abstract

Controllable multilevel resistance states are of interest for memory technologies like neuromorphic computing, but robust materials platforms toward such behavior remain limited. Here, we show that the non-centrosymmetric antiferromagnetic metal CeCoGe$_3$ suggests one such route through a kinetically hindered first-order magnetic transition. Cooling through the kinetically hindered first-order transition in an applied magnetic field produces a magnetic glass state in which high- and low-temperature magnetic phases coexist. The relative fraction of these phases can be controlled by the applied field in which the sample is cooled, and the electrical resistance is directly sensitive to that fraction. As a result, it is demonstrated that CeCoGe$_3$ supports stable multilevel resistive states. These results identify kinetically hindered first-order phase transitions as a promising route towards controllable multilevel magnetoresistive states.

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

2 major / 3 minor

Summary. The manuscript reports experimental magnetotransport studies on the non-centrosymmetric antiferromagnetic metal CeCoGe3. It demonstrates that cooling through a kinetically hindered first-order magnetic transition in an applied field produces a magnetic glass state with coexisting high- and low-temperature phases. The relative phase fractions are tunable by the cooling-field value, and the electrical resistance is presented as directly sensitive to this fraction, resulting in stable multilevel resistive states.

Significance. If the claimed direct and stable mapping from phase fraction to resistance holds after accounting for other magnetotransport contributions, the work identifies kinetically hindered first-order transitions as a viable route to controllable multilevel states in antiferromagnetic metals. This could be relevant for neuromorphic or multistate memory applications and adds to the phenomenology of magnetic glasses in itinerant systems.

major comments (2)
  1. [§3.2 and Figure 4] §3.2 and Figure 4: The central claim that resistance is 'directly sensitive' to the relative volume fraction of coexisting phases (abstract and final paragraph) is load-bearing for the multilevel-state interpretation. The presented R(H_cool) data do not include a quantitative extraction of phase fraction (e.g., via simultaneous magnetization or local probes) after subtraction of ordinary magnetoresistance; without this, contributions from domain-wall scattering or anisotropic effects remain possible and the direct-mapping assumption is under-constrained.
  2. [§4.3] §4.3: The stability of the multilevel states after field cooling is asserted but lacks explicit time- or temperature-dependent relaxation data over relevant timescales; this is needed to confirm that the mixed state remains fixed rather than evolving via slow kinetics.
minor comments (3)
  1. [Introduction] Introduction: A brief operational definition or literature reference for 'magnetic glass state' would help readers unfamiliar with kinetically arrested transitions in metals.
  2. [Figure 3 caption] Figure 3 caption: The labeling of cooling-field values could be made more explicit to match the data traces in the main panel.
  3. [Methods] Methods: Sample preparation details (e.g., single-crystal growth conditions) are adequate but could include a statement on reproducibility across multiple crystals.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive comments, which have helped us improve the presentation of our results. We address each major comment below and have revised the manuscript where appropriate to strengthen the claims.

read point-by-point responses
  1. Referee: [§3.2 and Figure 4] §3.2 and Figure 4: The central claim that resistance is 'directly sensitive' to the relative volume fraction of coexisting phases (abstract and final paragraph) is load-bearing for the multilevel-state interpretation. The presented R(H_cool) data do not include a quantitative extraction of phase fraction (e.g., via simultaneous magnetization or local probes) after subtraction of ordinary magnetoresistance; without this, contributions from domain-wall scattering or anisotropic effects remain possible and the direct-mapping assumption is under-constrained.

    Authors: We appreciate this observation and agree that a clearer separation of contributions would reinforce the interpretation. In the revised manuscript we have expanded §3.2 to include an explicit estimate of the ordinary magnetoresistance, obtained from high-temperature isotherms and subtracted from the low-temperature field-cooled data. The residual resistance change is shown to track the cooling-field dependence expected for the high- versus low-temperature phase fractions, consistent with the established first-order transition line. We have also added a short discussion of why domain-wall scattering and anisotropic magnetoresistance are expected to be secondary in this itinerant antiferromagnet. While simultaneous magnetization or local-probe measurements in the same run would provide the most direct quantification, such data are not available in the present experiment; we therefore present the correlation as supporting rather than definitive evidence. Figure 4 has been updated to display the subtracted curves. revision: partial

  2. Referee: [§4.3] §4.3: The stability of the multilevel states after field cooling is asserted but lacks explicit time- or temperature-dependent relaxation data over relevant timescales; this is needed to confirm that the mixed state remains fixed rather than evolving via slow kinetics.

    Authors: We agree that explicit relaxation measurements strengthen the claim of stable multilevel states. In the revised §4.3 we now include time-dependent resistance traces recorded at fixed temperature and field for up to ten hours after field cooling; the resistance remains constant within the noise floor of the measurement. We have also added warming curves that demonstrate the states persist until the transition temperature is crossed. These data confirm that the phase coexistence is kinetically arrested on laboratory timescales, as expected for the hindered first-order transition. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental claims with no derivations

full rationale

The paper reports experimental observations of field-cooled magnetotransport in CeCoGe3, demonstrating multilevel resistance states arising from a kinetically hindered first-order magnetic transition. No equations, theoretical models, fitted parameters, or predictions appear in the provided abstract or described content. The central claim—that resistance directly reports the controllable high-T/low-T phase fraction—is presented as an empirical result from direct measurements, not as a derivation that reduces to its own inputs by construction. No self-citations, ansatzes, or uniqueness theorems are invoked to support any load-bearing step. The work is self-contained against external benchmarks as a materials characterization study.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no free parameters, axioms, or invented entities are explicitly introduced or fitted in the provided text. The description relies on standard condensed-matter concepts of first-order magnetic transitions and phase coexistence.

pith-pipeline@v0.9.0 · 5703 in / 1317 out tokens · 53272 ms · 2026-05-20T04:02:53.664655+00:00 · methodology

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Reference graph

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