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Unveiling the 4f electrons hybridization in the CeCuSb2 heavy fermion

by Davi Zau, G. S. Freitas, P. G. Pagliuso, R. R. Urbano

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Authors (as registered SciPost users): Davi Zau
Submission information
Preprint Link: scipost_202208_00039v1  (pdf)
Date submitted: 2022-08-15 23:50
Submitted by: Zau, Davi
Submitted to: SciPost Physics Proceedings
Proceedings issue: International Conference on Strongly Correlated Electron Systems (SCES2022)
Ontological classification
Academic field: Physics
  • Condensed Matter Physics - Experiment
Approach: Experimental


In this work, we performed systematic Nuclear Magnetic Ressonance (NMR) and magnetic susceptibility experiments in CeCuSb2 singlecrystals. We obtained the NMR spectra and the transferred hyperfine coupling for the 63Cu site aiming to observe the correlation between the hyperfine coupling and the crystal eletric field (CEF) effects. Besides, we tried to elucidate the magnetic structure through NMR measurements at different magnetic fields alignments. We observed a magnetic transition at T ≈ 8 K much higher than the Neel temperature TN measured by magnetization suggesting the developing of short range magnetic order at this temperature. Also, the wipe out of the main resonance line and a persistent spin-echo signal through all the frequency swept range further support an incomensurate magnetic structure. Furthermore, the small values found for the transferred hyperfine coupling constant suggest a scenario much more localized than that observed for the CeTIn5 (T = Co,Rh,Ir). Additionally, a drastic change in the hybridization of the 63Cu site with the 4f1 Ce3+ electrons in distinct magnetic field orientation leads to a possible mapping of the 4f CEF ground-state orbital via NMR measurements.

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Has been resubmitted

Reports on this Submission

Anonymous Report 1 on 2022-11-29 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:scipost_202208_00039v1, delivered 2022-11-29, doi: 10.21468/SciPost.Report.6230


In the manuscript Zau et al. present NMR measurement to determine the hyperfine coupling constant in CeCuSb2. Its small value points to a localized nature of the f-electrons. The data are discussed in terms of the CEF ground state.

The paper reports new results and advances our knowledge of CeCuSb2 and related compounds. With suitable modifications it can be accepted for SciPost. Below I list some concerns, as well as suggestions to improve the paper.

1. In Fig. 2 the main results of the paper are presented: NME spectra. Several (broad) peak are observed, but only L1 and L2 get labels. Not everything is clear: L1 for field perpendicular to c is broad and seems to consist of 3 subpeaks. (e.g. at 20 K). Please explain. How is its value determined? What are the peaks with a positive Knight shift. Explain this to the non-expert reader.

2. The Clogston-Jaccarino (not Jacarinno) plot is fine, from this the hyperfine coupling constant is determined. But I find the ensuing discussion about Table 1 and Fig. 5 unclear. Please be more precise.

3. I also do not get the importance of Fig.6. The left 2 orbital states with alpha = 0.43 and 0.47 are almost identical. Then for alpha = 0.47 the most right diagram has a tilted ground state orbital. Why?

4. The authors should have their manuscript checked for English grammar, and correct typo’s. For instance in the abstract singlecrystals, eletric field, incomensurate. In Methods spectrum were obtained should read spectra were obtained. On the bottom of page 3: as Figure 2 should read in Figure 2. On page 4, probes should read probe, unexpecting should read unexpected. Etc.

5. Figure 7 can be deleted.

  • validity: -
  • significance: -
  • originality: -
  • clarity: -
  • formatting: -
  • grammar: -

Author:  Davi Zau  on 2023-04-04  [id 3547]

(in reply to Report 1 on 2022-11-29)

We thank the referee for the valuable report. We revised the entire data set and prepared a summary of the changes with a proper explanation for each question raised in the attached pdf file.



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