Abstract
We report a comprehensive de Haas–van Alphen (dHvA) study of the heavy-fermion material in magnetic fields up to 70 T. Several dHvA frequencies gradually emerge at high fields as a result of magnetic breakdown. Among them is the thermodynamically important branch, which has not been observed so far. Comparison of our angle-dependent dHvA spectra with those of the non- compound and with band-structure calculations evidences that the Ce electrons in remain localized over the whole field range. This rules out any significant Fermi-surface reconstruction, either at the suggested nematic phase transition at or at the putative quantum critical point at . Our results rather demonstrate the robustness of the Fermi surface and the localized nature of the electrons inside and outside of the antiferromagnetic phase.
- Received 11 May 2020
- Revised 18 November 2020
- Accepted 15 December 2020
DOI:https://doi.org/10.1103/PhysRevLett.126.016403
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