We report a comprehensive de Haas--van Alphen (dHvA) study of the heavy-fermion material CeRhIn5 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 β1 branch, which has not been observed so far. Comparison of our angule-dependent dHvA spectra with those of the non-4f compound LaRhIn5 and with band-structure calculations evidences that the Ce 4f electrons in CeRhIn5 remain localized over the whole field range. This rules out any significant Fermi-surface reconstruction, either at the suggested nematic phase transition at B∗≈ 30~T or at the putative quantum critical point at Bc≃ 50~T. Our results rather demonstrate the robustness of the Fermi surface and the localized nature of the 4f electrons inside and outside of the antiferromagnetic phase.
@article{arxiv.2101.05664,
title = {Robust Fermi-Surface Morphology of CeRhIn$_5$ across the Putative Field-Induced Quantum Critical Point},
author = {S. Mishra and J. Hornung and M. Raba and J. Klotz and T. Förster and H. Harima and D. Aoki and J. Wosnitza and A. McCollam and I. Sheikin},
journal= {arXiv preprint arXiv:2101.05664},
year = {2021}
}