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Local investigation of the crystal electric field ground-state in CeCu(Sb,Bi)2 heavy fermions.

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

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Submission summary

Authors (as registered SciPost users): Davi Zau
Submission information
Preprint Link: scipost_202208_00039v2  (pdf)
Date accepted: 2023-04-24
Date submitted: 2023-04-04 21:45
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 Resonance (NMR) and magnetic susceptibility experiments in CeCuSb2 single-crystals. The main findings were compared to previous report for CeCuBi2. [1] The NMR spectra and transferred hyperfine coupling for the 63Cu nuclei were obtained aiming to observe their correlation with the crystal electric field (CEF) effects on the Ce3+ (J = 5/2) multiplet. Besides, in an attempt to elucidate the magnetic structure through NMR measurements at different magnetic fields orientations, we observed a magnetic transition at T ≈ 8 K higher than the Néel temperature TN measured by magnetic susceptibility indicating the development of short-range magnetic ordering above TN . In addition, the wipe out of the main NMR resonance line and a persistent spin-echo signal throughout the whole frequency-swept range suggest the possibility of an incommensurate magnetic structure in CeCuSb2. Furthermore, the small transferred hyperfine coupling constant found for CeCuSb2 indicates a scenario with more localized Ce3+ 4f electrons than for CeMIn5 (M = Co,Rh,Ir) heavy fermions family. Additionally, subtle changes in the hybridization between the 63Cu with the 4f1 Ce3+ electrons in distinct magnetic field orientations allowed us to provide detailed information and map out the 4f CEF orbital ground-state of CeCu(Sb,Bi)2 via NMR measurements.

Author comments upon resubmission

Dear Editor,
Hereby we resubmit the manuscript Unveiling the 4f electrons hybridization in the CeCuSb2 heavy fermion, by Davi Zau, G.S. Freitas, P.G. Pagliuso, and R. R. Urbano for your reconsideration. We are grateful to the Referee for his thorough revision and appreciation of the great effort to get and analyze such experimental data as well as for his positive evaluation of our manuscript. In this revised version we rephrased some parts of the discussion and corrected the grammar in order to comply with all necessary modifications. We strongly believe that the manuscript in its revised version is both technically accurate and of sufficient significance to merit publication. Sincerely yours, Davi Zau on behalf of all co-authors.

List of changes

We reanalyzed all the data to eliminate any FFTsum artifacts. In fact, the graphs are now in a version much clearer to the reader. However, the overall results did not change.

We rephrased some of the discussion principally the discussion about the relation between the hyperfine coupling and the ground state CEF parameters.

We changed the title to best suit the conclusions to: Local investigation of the crystal electric field ground-state in CeCu(Sb,Bi)2 heavy fermions.

We corrected the grammar.

Published as SciPost Phys. Proc. 11, 017 (2023)

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