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arxiv: 2511.18195 · v1 · submitted 2025-11-22 · ❄️ cond-mat.mtrl-sci

Engineering the Magnetocaloric Effect in NdT₄B

Kyle W. Fruhling , Enrique O. Gonz\'alez Delgado , Siddharth Nandanwar , Xiaohan Yao , Zafer Turgut , Michael A. Susner , Fazel Tafti This is my paper

Pith reviewed 2026-05-17 06:18 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords magnetocaloric effectNdT4Bternary phase diagramkagome ferromagnetentropy changecomposition tuningmulti-stage coolingtransition metal substitution
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The pith

Ternary phase diagrams guide selection of NdFe1.15Co0.46Ni2.39B to maximize the magnetocaloric effect in the NdT4B system.

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

The paper constructs ternary phase diagrams from standard magnetocaloric metrics across Fe, Co, and Ni substitutions in NdT4B compounds. These diagrams identify how varying the transition metals tunes the entropy change, ordering temperature, and transition width to produce large responses. The authors then report an engineered composition that achieves strong performance over hundreds of Kelvin. The family shows usable entropy shifts from roughly 10 K to 650 K, with some samples displaying two distinct peaks that release comparable entropy at separated temperatures.

Core claim

By measuring the magnetocaloric effect with conventional metrics in the NdT4B kagome ferromagnets and mapping the results onto ternary diagrams of Fe-Co-Ni content, the work isolates the composition NdFe1.15Co0.46Ni2.39B that maximizes the effect. The NdT4B system produces notable magnetic entropy changes over the wide interval from about 10 K to 650 K, and selected compositions maintain sizable responses across hundreds of degrees; a subset of these compositions further exhibits two-peak behavior in which two transitions release comparable entropy.

What carries the argument

Ternary phase diagrams of magnetocaloric metrics plotted against Fe, Co, and Ni concentrations, used to locate the composition that maximizes entropy change.

If this is right

  • The composition NdFe1.15Co0.46Ni2.39B is identified as the one that maximizes the magnetocaloric effect within the mapped system.
  • Particular NdT4B compositions deliver notable magnetocaloric performance spanning hundreds of Kelvin.
  • The overall system exhibits usable entropy change from approximately 10 K to 650 K, making it relevant for wide-temperature-range technologies.
  • A few compositions display two-peak magnetocaloric behavior in which two transitions release comparable entropy, offering a platform for multi-stage cooling studies.

Where Pith is reading between the lines

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

  • The same diagram-guided substitution strategy could be applied to other rare-earth transition-metal borides to locate additional high-performance compositions.
  • Materials with entropy changes distributed over such a wide interval might simplify refrigeration designs that currently require separate stages or materials for different temperature bands.
  • Two-peak entropy release at well-separated temperatures could be tested directly as an intrinsic route to cascaded cooling without added hardware.

Load-bearing premise

That the standard magnetocaloric metrics used to build the ternary diagrams accurately locate the global performance maximum without bias from experimental uncertainties in magnetization or heat-capacity data.

What would settle it

A full temperature-dependent measurement of the magnetic entropy change for NdFe1.15Co0.46Ni2.39B and for several neighboring compositions that would show whether the selected point indeed produces the largest integrated effect or whether another point in the diagram is superior.

Figures

Figures reproduced from arXiv: 2511.18195 by Enrique O. Gonz\'alez Delgado, Fazel Tafti, Kyle W. Fruhling, Michael A. Susner, Siddharth Nandanwar, Xiaohan Yao, Zafer Turgut.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Crystal structure of NdNi [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. For various transition metal ratios, the color plots sho [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Top: characterizing the MCE in NdFe [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
read the original abstract

We present a comprehensive study of the magnetocaloric effect (MCE) in the Nd$T_4$B system where $T$ = Fe, Co, and Ni. These compounds are ferromagnetic kagome materials with tunable ordering temperatures, transition width, and magnetic moments depending on the choice of transition metal. Thus, they are good candidates for investigating the MCE. We characterize the MCE using standard metrics and construct ternary phase diagrams as functions of Fe, Co, and Ni concentrations. Using these phase diagrams, we engineer the composition NdFe$_{1.15}$Co$_{0.46}$Ni$_{2.39}$B to maximize the MCE. Interestingly, the Nd$T_4$B system shows a notable entropy change over a wide temperature range ($\sim$10 to 650 K), and particular compositions have notable MCEs spanning hundreds of Kelvin, making this a suitable system to study for technologies used in a wide range of temperatures. In a few cases, we observe a two-peak MCE. These two transitions, releasing comparable entropy, provide an interesting platform to study for applications in multi-stage cooling.

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 / 2 minor

Summary. The manuscript presents a comprehensive experimental study of the magnetocaloric effect (MCE) in the NdT₄B system (T = Fe, Co, Ni). The authors characterize the MCE using standard metrics, construct ternary phase diagrams as functions of Fe, Co, and Ni concentrations, and identify the composition NdFe₁.₁₅Co₀.₄₆Ni₂.₃₉B as the one that maximizes the MCE. They report notable entropy changes over a wide temperature range (~10 to 650 K) and note two-peak MCE behavior in some compositions, positioning the system for potential multi-stage cooling applications.

Significance. If the phase diagrams reliably locate the global MCE maximum without bias from unaccounted uncertainties, the work would provide a useful compositional map for tuning MCE in this family of kagome ferromagnets, with the broad temperature span and two-peak entropy release offering practical advantages for wide-range and multi-stage refrigeration. The experimental approach of directly measuring and mapping MCE metrics is a strength when supported by transparent data.

major comments (2)
  1. [Phase diagram construction and results] The central claim that the ternary phase diagrams allow engineering of NdFe₁.₁₅Co₀.₄₆Ni₂.₃₉B as the MCE-maximizing composition rests on the assumption that the diagrams accurately reflect the true optimum. However, the manuscript provides no indication that uncertainties in the underlying magnetization and specific-heat data were quantified or propagated into the diagrams or interpolations (see description of phase diagram construction and the engineered composition).
  2. [Experimental methods and results] No raw data, error bars, sample preparation details, or validation measurements are shown for the selected composition or the metrics used to build the diagrams, which undermines assessment of whether the reported maximum is robust against experimental variation or integration errors in ΔS and RCP, especially across the broad 10–650 K window and in cases with two-peak behavior.
minor comments (2)
  1. [MCE characterization] Clarify the exact definition of the MCE metrics (e.g., whether ΔS is isothermal entropy change at a fixed field or integrated) and how the two-peak cases are handled in the phase diagrams.
  2. [Abstract and composition notation] The composition formula NdFe₁.₁₅Co₀.₄₆Ni₂.₃₉B should explicitly confirm that the T-site occupancies sum to 4.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript on the magnetocaloric effect in the NdT4B system and for the constructive comments. We address each major point below and indicate the revisions we will make.

read point-by-point responses

  1. Referee: [Phase diagram construction and results] The central claim that the ternary phase diagrams allow engineering of NdFe₁.₁₅Co₀.₄₆Ni₂.₃₉B as the MCE-maximizing composition rests on the assumption that the diagrams accurately reflect the true optimum. However, the manuscript provides no indication that uncertainties in the underlying magnetization and specific-heat data were quantified or propagated into the diagrams or interpolations (see description of phase diagram construction and the engineered composition).

    Authors: We agree that explicit quantification and propagation of uncertainties from the magnetization and specific-heat measurements into the ternary phase diagrams and the identification of the optimal composition would strengthen the central claim. The original manuscript described the diagram construction but did not include a dedicated error analysis. In the revised version we will add this analysis, including estimates of uncertainties in ΔS and RCP and a discussion of whether they affect the location of the maximum or the choice of NdFe1.15Co0.46Ni2.39B. revision: yes

  2. Referee: [Experimental methods and results] No raw data, error bars, sample preparation details, or validation measurements are shown for the selected composition or the metrics used to build the diagrams, which undermines assessment of whether the reported maximum is robust against experimental variation or integration errors in ΔS and RCP, especially across the broad 10–650 K window and in cases with two-peak behavior.

    Authors: We acknowledge that greater transparency in experimental details and data presentation is needed. In the revision we will include error bars on the key MCE figures, expand the sample-preparation description, and add representative raw data or validation measurements for the optimized composition. We will also clarify the integration procedure for ΔS and RCP over the wide temperature range and for the two-peak cases, together with any consistency checks performed. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental data and phase diagrams are self-contained

full rationale

The paper performs direct magnetization and specific-heat measurements on multiple NdT4B compositions, computes standard MCE metrics (ΔS, RCP) from those raw data, interpolates ternary phase diagrams, and selects NdFe1.15Co0.46Ni2.39B as the composition that maximizes the observed effect. No equations, fitted parameters, or self-citations are invoked as load-bearing steps in the derivation; the central claim rests on empirical values rather than reducing to its own inputs by construction. This is the expected outcome for a purely experimental materials study.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on experimental measurements of magnetization and entropy change using conventional MCE analysis techniques; no new theoretical entities or derivations are introduced.

free parameters (1)
  • Selected composition ratios
    The specific values Fe=1.15, Co=0.46, Ni=2.39 were chosen after mapping the ternary diagrams to maximize the reported MCE metric.
axioms (1)
  • domain assumption Standard magnetocaloric metrics (entropy change from Maxwell relations or direct calorimetry) correctly quantify the effect in these ferromagnetic kagome compounds
    Invoked when the abstract states that MCE was characterized using standard metrics and phase diagrams were constructed from those metrics.

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    Two-Peak Behavior As mentioned in the main text, some Nd T 4B materials show two transitions or one very wide transition leading to − ∆ Sm plots with two peaks. In Fig. S8, we present the magnetic entropy data for the materials with clear two- peak behavior. We also show the two-Voigt profile fit as described in Eq. 5 in the main text. Under this fit, we S2 ...

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