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Band-selective Kondo coupling generates the quasi-one-dimensional ferromagnetic excitations in CeSb2.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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2026-06-29 05:45 UTC pith:CKELOGU2

load-bearing objection ARPES shows no SDW gap and selective 4f weight on C2 pockets, but the Kondo-coupling attribution lacks matrix-element controls. the 1 major comments →

arxiv 2605.30074 v1 pith:CKELOGU2 submitted 2026-05-28 cond-mat.str-el cond-mat.supr-con

Electronic Origin of Ferromagnetic Excitations in the Candidate Spin-Triplet Superconductor CeSb2

Xiaoxiao Wang , Xiaoyang Chen , Suppanut Sangphet , Yifei Fang , Yilin Wang , Chihao Li , Minyinan Lei , Nan Guo
show 4 more authors
Yuanhe Song Rui Peng Haichao Xu Donglai Feng
This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords CeSb2resonant ARPESband-selective Kondo couplingquasi-one-dimensional ferromagnetic excitationsspin-triplet superconductorf-electron systemsanisotropic magnetic exchangecompeting magnetic orders
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

The paper examines why quasi-one-dimensional ferromagnetic excitations appear in the candidate spin-triplet superconductor CeSb2 despite its quasi-two-dimensional lattice. High-resolution ARPES finds no spin-density-wave gap on the dispersive Fermi pockets, which disfavors a nesting mechanism. Resonant ARPES instead detects strong selective enhancement of Ce 4f spectral weight specifically on the C2-distributed Fermi pockets that align with the Ce ladder. This pattern indicates band-selective Kondo coupling, which in turn produces strongly anisotropic magnetic exchange interactions. The resulting anisotropy accounts for both the observed ferromagnetic excitations and the competing magnetic orders in this f-electron material.

Core claim

High-resolution ARPES resolves no spin-density-wave gap on the dispersive Fermi pockets, disfavoring a nesting-driven mechanism for the q1D FM excitations. Instead, resonant ARPES reveals a pronounced selective enhancement of Ce 4f spectral weight on the C2-distributed Fermi pockets aligned with the Ce ladder. This observation signifies band-selective Kondo coupling that generates strongly anisotropic magnetic exchange interactions, which can naturally account for both the q1D ferromagnetic excitations and the competing magnetic orders.

What carries the argument

Band-selective Kondo coupling identified via selective Ce 4f spectral weight enhancement on C2-distributed Fermi pockets aligned with the Ce ladder, which produces anisotropic magnetic exchange interactions.

Load-bearing premise

The selective enhancement of Ce 4f spectral weight is caused by band-selective Kondo coupling rather than photoemission matrix-element effects or differing hybridization strengths.

What would settle it

Observation of a spin-density-wave gap on the dispersive Fermi pockets, or a demonstration that matrix-element calculations reproduce the 4f intensity pattern without Kondo coupling, would falsify the mechanism.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • Absence of an SDW gap rules out nesting as the driver of the q1D excitations.
  • Selective 4f enhancement on ladder-aligned pockets signals band-selective Kondo coupling.
  • The coupling produces strongly anisotropic magnetic exchange interactions.
  • Anisotropic exchange accounts for both the q1D ferromagnetic excitations and competing magnetic orders.
  • The same mechanism can explain emergent low-dimensional magnetism in other correlated f-electron systems.

Where Pith is reading between the lines

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

  • The selectivity may extend to other Ce-based ladder compounds and could be tuned by doping or pressure.
  • Anisotropic exchange fluctuations from this coupling might help stabilize the spin-triplet superconducting state.
  • Direct comparison of ARPES intensity with matrix-element simulations on the same pockets would test the Kondo interpretation.
  • Temperature-dependent ARPES could reveal how the selective 4f weight evolves near magnetic ordering temperatures.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

1 major / 0 minor

Summary. The manuscript claims that high-resolution ARPES on CeSb2 shows no spin-density-wave gap on the dispersive Fermi pockets, ruling out a nesting-driven origin for the q1D ferromagnetic excitations. Resonant ARPES instead reveals selective enhancement of Ce 4f spectral weight on the C2-distributed Fermi pockets aligned with the Ce ladder; this is interpreted as band-selective Kondo coupling that produces strongly anisotropic magnetic exchange interactions, naturally explaining both the q1D FM excitations and the competing magnetic orders.

Significance. If the causal link from selective intensity to band-selective Kondo coupling holds, the result supplies an electronic mechanism for emergent low-dimensional magnetism in correlated f-electron systems without requiring nesting, with potential relevance to other candidate spin-triplet superconductors.

major comments (1)
  1. [Abstract] Abstract: the central claim that the observed C2-pocket-selective Ce 4f intensity increase 'signifies band-selective Kondo coupling' is load-bearing for the proposed mechanism, yet the manuscript supplies no polarization-dependent data, off-resonance comparison, or matrix-element calculation to discriminate this from known alternatives (dipole matrix elements varying with orbital symmetry/k-point or momentum-dependent hybridization strengths).

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading and constructive feedback on our manuscript. We address the single major comment below and will revise the manuscript accordingly to strengthen the presentation of our interpretation.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that the observed C2-pocket-selective Ce 4f intensity increase 'signifies band-selective Kondo coupling' is load-bearing for the proposed mechanism, yet the manuscript supplies no polarization-dependent data, off-resonance comparison, or matrix-element calculation to discriminate this from known alternatives (dipole matrix elements varying with orbital symmetry/k-point or momentum-dependent hybridization strengths).

    Authors: We appreciate the referee identifying this point. The resonant ARPES enhancement occurs specifically at the Ce 4f resonance energy and is confined to the C2 pockets that align with the real-space Ce ladder direction; this momentum-space pattern, together with the lack of an SDW gap on the dispersive pockets, forms the basis for interpreting the data as evidence of band-selective Kondo coupling. We acknowledge, however, that the manuscript does not contain polarization-dependent ARPES, explicit off-resonance comparisons, or matrix-element calculations that would quantitatively exclude orbital-symmetry or hybridization-induced intensity variations. In the revised manuscript we will (i) change the abstract wording from 'signifies' to 'is consistent with' band-selective Kondo coupling, (ii) add a dedicated paragraph in the discussion that addresses possible matrix-element contributions and explains why the observed selectivity tracks the Ce-ladder geometry rather than generic k-dependent matrix elements, and (iii) include any available off-resonance spectra for direct comparison. These changes will make the evidential basis explicit without overstating the current data. revision: partial

Circularity Check

0 steps flagged

No circularity: interpretive attribution of ARPES intensity to Kondo mechanism rests on observation, not self-referential reduction

full rationale

The paper's central claim is an experimental observation (selective Ce 4f enhancement on C2 pockets via resonant ARPES) followed by an interpretive attribution to band-selective Kondo coupling that then explains anisotropic exchange and q1D FM excitations. No equations, fitted parameters, self-citations, or uniqueness theorems appear in the provided text that would make the claimed mechanism reduce to its own inputs by construction. The step from intensity map to Kondo interpretation is causal attribution subject to alternative explanations (matrix elements, hybridization), but it is not a self-definitional or fitted-input loop. The derivation chain is therefore self-contained against external benchmarks and receives the default non-finding.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only review; no explicit free parameters, axioms, or invented entities are stated. The central claim rests on standard ARPES interpretation of spectral weight as a proxy for Kondo coupling strength.

axioms (1)
  • domain assumption ARPES spectral weight directly reflects the strength of Kondo coupling between Ce 4f states and specific conduction bands
    The interpretation of selective enhancement as band-selective Kondo coupling assumes this standard mapping holds without significant matrix-element distortions.

pith-pipeline@v0.9.1-grok · 5743 in / 1261 out tokens · 27020 ms · 2026-06-29T05:45:32.364445+00:00 · methodology

0 comments
read the original abstract

The origin of quasi-one-dimensional (q1D) ferromagnetic (FM) excitations in the candidate spin-triplet superconductor CeSb$_2$ has remained unclear. Here we report an electronic mechanism for emergent q1D magnetism in the quasi-two-dimensional lattice of CeSb$_2$, revealed by angle-resolved photoemission spectroscopy (ARPES). High-resolution ARPES resolves no spin-density-wave gap on the dispersive Fermi pockets, disfavoring a nesting-driven mechanism for the q1D FM excitations. Instead, resonant ARPES reveals a pronounced selective enhancement of Ce 4$f$ spectral weight on the $C_2$-distributed Fermi pockets aligned with the Ce ladder. This observation signifies band-selective Kondo coupling that generates strongly anisotropic magnetic exchange interactions, which can naturally account for both the q1D ferromagnetic excitations and the competing magnetic orders. Our results identify a band-selective Kondo coupling mechanism for emergent low-dimensional magnetism in correlated $f$-electron systems.

Figures

Figures reproduced from arXiv: 2605.30074 by Chihao Li, Donglai Feng, Haichao Xu, Minyinan Lei, Nan Guo, Rui Peng, Suppanut Sangphet, Xiaoxiao Wang, Xiaoyang Chen, Yifei Fang, Yilin Wang, Yuanhe Song.

Figure 2
Figure 2. Figure 2: FIG. 2. (a) Valence band dispersions near [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Photoemission intensity along [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (c), despite the quasi-2D crystal structure. One plausible manifestation of the band-selective Kondo coupling could be Ruderman-Kittel-Kasuya-Yosida (RKKY)- type magnetic exchange J(r) along the Ce-ladder direction b. Through a simplified simulation in Supplementary Materials Sec. IX [35, 51–53], the α and η pockets favor AFM and FM nearest-neighbor exchange channels, respectively, suggesting competing mag… view at source ↗

discussion (0)

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Reference graph

Works this paper leans on

57 extracted references

  1. [1]

    Miyake, S

    K. Miyake, S. Schmitt-Rink, and C. V arma, Physical Revie w B 34, 6554 (1986)

    1986

  2. [2]

    Fujita, H

    M. Fujita, H. Hiraka, M. Matsuda, M. Matsuura, J. M. Tran- quada, S. Wakimoto, G. Xu, and K. Yamada, Journal of the Physical Society of Japan 81, 011007 (2011)

    2011

  3. [3]

    D. J. Scalapino, Reviews of Modern Physics 84, 1383 (2012)

    2012

  4. [4]

    M. Dean, A. James, R. Springell, X. Liu, C. Monney, K. Zhou , R. Konik, J. Wen, Z. Xu, G. Gu, et al., Physical Review Letters 110, 147001 (2013)

    2013

  5. [5]

    H. Zhi, T. Imai, F. Ning, J.-K. Bao, and G.-H. Cao, Physica l Review Letters 114, 147004 (2015)

    2015

  6. [6]

    Bao, J.-Y

    J.-K. Bao, J.-Y . Liu, C.-W. Ma, Z.-H. Meng, Z.-T. Tang, Y . -L. Sun, H.-F. Zhai, H. Jiang, H. Bai, C.-M. Feng, et al., Physical Review X 5, 011013 (2015)

    2015

  7. [7]

    Balakirev, T

    F. Balakirev, T. Kong, M. Jaime, R. McDonald, C. Mielke, A. Gurevich, P . Canfield, and S. Bud’ko, Physical Review B 91, 220505 (2015)

    2015

  8. [8]

    J. Yang, J. Luo, C. Yi, Y . Shi, Y . Zhou, and G.-q. Zheng, Science Advances 7, eabl4432 (2021)

    2021

  9. [9]

    S. Ran, C. Eckberg, Q.-P . Ding, Y . Furukawa, T. Metz, S. R. Saha, I.-L. Liu, M. Zic, H. Kim, J. Paglione, et al. , Science 365, 684 (2019)

    2019

  10. [10]

    Y . Xu, Y . Sheng, and Y .-f. Yang, Physical Review Letters 123, 217002 (2019)

    2019

  11. [11]

    Knafo, G

    W. Knafo, G. Knebel, P . Ste ffens, K. Kaneko, A. Rosuel, J.- P . Brison, J. Flouquet, D. Aoki, G. Lapertot, and S. Raymond, Physical Review B 104, L100409 (2021)

    2021

  12. [12]

    Y . Li, X. Xu, M.-H. Lee, M.-W. Chu, and C. Chien, Science 366, 238 (2019)

    2019

  13. [13]

    Ishihara, M

    K. Ishihara, M. Roppongi, M. Kobayashi, K. Imamura, Y . Mizukami, H. Sakai, P . Opletal, Y . Tokiwa, Y . Haga, K. Hashimoto, et al., Nature Communications 14, 2966 (2023)

    2023

  14. [14]

    Tsutsumi and K

    Y . Tsutsumi and K. Machida, Physical Review B 110, L060507 (2024)

    2024

  15. [15]

    Wu, C.-C

    X.-X. Wu, C.-C. Le, J. Y uan, H. Fan, and J.-P . Hu, Chinese Physics Letters 32, 057401 (2015)

    2015

  16. [16]

    Cuono, F

    G. Cuono, F. Forte, A. Romano, X. Ming, J. Luo, C. Autieri , and C. Noce, Physical Review B 103, 214406 (2021)

    2021

  17. [17]

    Sundar, S

    S. Sundar, S. Gheidi, K. Akintola, A. Cˆ ot´ e, S. Dunsiger, S. Ran, N. Butch, S. Saha, J. Paglione, and J. Sonier, Physical Revie w B 100, 140502 (2019)

    2019

  18. [18]

    C. Duan, K. Sasmal, M. B. Maple, A. Podlesnyak, J.-X. Zhu , Q. Si, and P . Dai, Physical Review Letters 125, 237003 (2020)

    2020

  19. [19]

    C. Duan, R. Baumbach, A. Podlesnyak, Y . Deng, C. Moir, A. J. Breindel, M. B. Maple, E. Nica, Q. Si, and P . Dai, Nature 600, 636 (2021)

    2021

  20. [20]

    O. P . Squire, S. A. Hodgson, J. Chen, V . Fedoseev, C. K. de Podesta, T. I. Weinberger, P . L. Alireza, and F. M. Grosche , Physical Review Letters 131, 026001 (2023)

    2023

  21. [21]

    Z. Shan, Y . Jiao, J. Guo, Y . Wang, J. Wu, J. Zhang, Y . Zhang , D. Su, D. T. Adroja, C. Balz, et al. , Physical Review Letters 134, 116704 (2025)

    2025

  22. [22]

    Zhang, X

    Y . Zhang, X. Zhu, B. Hu, S. Tan, D. Xie, W. Feng, L. Qin, W. Zhang, Y . Liu, H. Song,et al., Chinese Physics B 26, 067102 (2017)

    2017

  23. [23]

    Zhang, X

    Y . Zhang, X. Luo, W. Feng, S. Tan, Q. Hao, Q. Zhang, D. Y uan, B. Wang, Y . Liu, Q. Liu,et al., Physical Review B 106, 045133 (2022)

    2022

  24. [24]

    Trainer, C

    C. Trainer, C. Abel, S. L. Bud’ko, P . C. Canfield, and P . Wa hl, Physical Review B 104, 205134 (2021)

    2021

  25. [25]

    B. Liu, L. Wang, I. Radelytskyi, Y . Zhang, M. Meven, H. Deng, F. Zhu, Y . Su, X. Zhu, S. Tan, et al., Journal of Physics: Con- densed Matter 32, 405605 (2020)

    2020

  26. [26]

    Zhang, M

    S. Zhang, M. Li, Y . Yang, C. Zhao, M. He, Y . Hang, and Y . Fang, CrystEngComm23, 5045 (2021)

    2021

  27. [27]

    P . C. Canfield, J. Thompson, and Z. Fisk, Journal of Appli ed Physics 70, 5992 (1991)

    1991

  28. [28]

    S. L. Bud’ko, P . Canfield, C. Mielke, and A. Lacerda, Phys ical Review B 57, 13624 (1998)

    1998

  29. [29]

    R. F. Luccas, A. Fente, J. Hanko, A. Correa-Orellana, E. Her- rera, E. Climent-Pascual, J. Azpeitia, T. P´ erez-Casta˜ ne da, M. Osorio, E. Salas-Colera, et al. , Physical Review B 92, 235153 (2015)

    2015

  30. [30]

    Haule, C.-H

    K. Haule, C.-H. Yee, and K. Kim, Physical Review B 81, 195107 (2010)

    2010

  31. [31]

    Haule and T

    K. Haule and T. Birol, Physical Review Letters 115, 256402 (2015)

    2015

  32. [32]

    Blaha, K

    P . Blaha, K. Schwarz, F. Tran, R. Laskowski, G. K. Madsen , and L. D. Marks, The Journal of Chemical Physics 152, 074101 (2020)

    2020

  33. [33]

    Haule, Physical Review Letters 115, 196403 (2015)

    K. Haule, Physical Review Letters 115, 196403 (2015)

    2015

  34. [34]

    E. Gull, A. J. Millis, A. I. Lichtenstein, A. N. Rubtsov, M. Troyer, and P . Werner, Reviews of Modern Physics 83, 349 (2011)

    2011

  35. [35]

    See Supplemental Material

  36. [36]

    Q. Chen, D. Xu, X. Niu, J. Jiang, R. Peng, H. Xu, C. Wen, Z. Ding, K. Huang, L. Shu, et al. , Physical Review B 96, 045107 (2017)

    2017

  37. [37]

    S. Jang, R. Kealhofer, C. John, S. Doyle, J.-S. Hong, J. H . Shim, Q. Si, O. Erten, J. D. Denlinger, and J. G. Analytis, Science Advances 5, eaat7158 (2019)

    2019

  38. [38]

    Q. Chen, D. Xu, X. Niu, R. Peng, H. C. Xu, C. Wen, X. Liu, 6 L. Shu, S. Tan, X. Lai, et al. , Physical Review Letters 120, 066403 (2018)

    2018

  39. [39]

    Q. Chen, C. Wen, Q. Yao, K. Huang, Z. Ding, L. Shu, X. Niu, Y . Zhang, X. Lai, Y . Huang, et al. , Physical Review B 97, 075149 (2018)

    2018

  40. [40]

    Poelchen, S

    G. Poelchen, S. Schulz, M. Mende, M. G¨ uttler, A. Gener- alov, A. V . Fedorov, N. Caroca-Canales, C. Geibel, K. Kliemt , C. Krellner, et al., npj Quantum Materials 5, 70 (2020)

    2020

  41. [41]

    Z. Wu, Y . Fang, H. Su, W. Xie, P . Li, Y . Wu, Y . Huang, D. Shen, B. Thiagarajan, J. Adell, et al. , Physical Review Letters 127, 067002 (2021)

    2021

  42. [42]

    Knopp, A

    G. Knopp, A. Loidl, K. Knorr, L. Pawlak, M. Duczmal, R. Ca s- pary, U. Gottwick, H. Spille, F. Steglich, and A. Murani, Zeitschrift f¨ ur Physik B Condensed Matter77, 95 (1989)

    1989

  43. [43]

    D. M. Fobes, E. D. Bauer, J. D. Thompson, A. Sazonov, V . Hutanu, S. Zhang, F. Ronning, and M. Janoschek, Journal of Physics: Condensed Matter 29, 17LT01 (2017)

    2017

  44. [44]

    M. Raba, E. Ressouche, N. Qureshi, C. Colin, V . Nassif, S . Ota, Y . Hirose, R. Settai, P . Rodi` ere, and I. Sheikin, Physical Review B 95, 161102 (2017)

    2017

  45. [45]

    Smidman, D

    M. Smidman, D. Adroja, A. D. Hillier, L. Chapon, J. Taylo r, V . Anand, R. P . Singh, M. R. Lees, E. Goremychkin, M. Koza, et al., Physical Review B 88, 134416 (2013)

    2013

  46. [46]

    Y . Luo, C. Zhang, Q.-Y . Wu, F.-Y . Wu, J.-J. Song, W. Xia, Y . Guo, J. Rusz, P . M. Oppeneer, T. Durakiewicz,et al., Physi- cal Review B 101, 115129 (2020)

    2020

  47. [47]

    apRoberts Warren, A

    N. apRoberts Warren, A. Dioguardi, A. Shockley, C. Lin, J. Crocker, P . Klavins, D. Pines, Y .-F. Yang, and N. Curro, Phys- ical Review B 83, 060408 (2011)

    2011

  48. [48]

    K. R. Shirer, A. C. Shockley, A. P . Dioguardi, J. Crocker , C. H. Lin, N. apRoberts Warren, D. M. Nisson, P . Klavins, J. C. Coo- ley, Y .-f. Yang,et al., Proceedings of the National Academy of Sciences 109, E3067 (2012)

    2012

  49. [49]

    P . Li, H. Ye, Y . Hu, Y . Fang, Z. Xiao, Z. Wu, Z. Shan, R. P . Singh, G. Balakrishnan, D. Shen, et al., Physical Review B 107, L201104 (2023)

    2023

  50. [50]

    Wu, Q.-Y

    F.-Y . Wu, Q.-Y . Wu, C. Zhang, Y . Luo, X. Liu, Y .-F. Xu, D.- H. Lu, M. Hashimoto, H. Liu, Y .-Z. Zhao, et al. , Frontiers of Physics 18, 53304 (2023)

    2023

  51. [51]

    Litvinov and V

    V . Litvinov and V . Dugaev, Physical Review B58, 3584 (1998)

    1998

  52. [52]

    Blundell, Magnetism in condensed matter (OUP Oxford, 2001)

    S. Blundell, Magnetism in condensed matter (OUP Oxford, 2001)

    2001

  53. [53]

    T. M. Rusin and W. Zawadzki, Journal of Magnetism and Mag - netic Materials 441, 387 (2017)

    2017

  54. [54]

    B. K. Gamble, Specific heat and transport properties of the light rare-earth diantimonides (Clemson University, 2002)

    2002

  55. [55]

    Arndt, O

    J. Arndt, O. Stockert, K. Schmalzl, E. Faulhaber, H. S. J eevan, C. Geibel, W. Schmidt, M. Loewenhaupt, and F. Steglich, Phys- ical Review Letters 106, 246401 (2011)

    2011

  56. [56]

    Saxena, P

    S. Saxena, P . Agarwal, K. Ahilan, F. Grosche, R. Haselwimmer, M. Steiner, E. Pugh, I. Walker, S. Julian, P . Monthoux, et al. , Nature 406, 587 (2000)

    2000

  57. [57]

    D. Aoki, A. Huxley, E. Ressouche, D. Braithwaite, J. Flo uquet, J.-P . Brison, E. Lhotel, and C. Paulsen, Nature 413, 613 (2001)

    2001