Article Dans Une Revue Physical Review Letters Année : 2021

Robust fermi-surface morphology of cerhin 5 across the putative field-induced quantum critical point

Résumé

We report a comprehensive de Haas--van Alphen (dHvA) study of the heavy-fermion material CeRhIn$_5$ 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 $\beta_1$ branch, which has not been observed so far. Comparison of our angule-dependent dHvA spectra with those of the non-$4f$ compound LaRhIn$_5$ and with band-structure calculations evidences that the Ce $4f$ electrons in CeRhIn$_5$ remain localized over the whole field range. This rules out any significant Fermi-surface reconstruction, either at the suggested nematic phase transition at $B^{*}\approx$ 30~T or at the putative quantum critical point at $B_c \simeq$ 50~T. Our results rather demonstrate the robustness of the Fermi surface and the localized nature of the 4$f$ electrons inside and outside of the antiferromagnetic phase.

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hal-03113393 , version 1 (02-06-2025)

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Ilya Sheikin, J. Hornung, M. Raba, J. Klotz, T. Förster, et al.. Robust fermi-surface morphology of cerhin 5 across the putative field-induced quantum critical point. Physical Review Letters, 2021, 126 (1), ⟨10.1103/PhysRevLett.126.016403⟩. ⟨hal-03113393⟩
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