Fermi Surfaces in the Antiferromagnetic, Paramagnetic and Polarized Paramagnetic States of CeRh 2 Si 2 Compared with Quantum Oscillation Experiments - Université Toulouse 3
Article Dans Une Revue Journal of the Physical Society of Japan Année : 2017

Fermi Surfaces in the Antiferromagnetic, Paramagnetic and Polarized Paramagnetic States of CeRh 2 Si 2 Compared with Quantum Oscillation Experiments

Résumé

The large quantum oscillations observed in the thermoelectric power in the antiferromagnetic (AF) state of the heavy-fermion compound CeRh2Si2 disappear suddenly when entering in the polarized paramagnetic (PPM) state at Hc ∼ 26.5 T, indicating an abrupt reconstruction of the Fermi surface. The electronic band structure was calculated using [LDA+U] for the AF state taking the correct magnetic structure into account, for the PPM state, and for the paramagnetic state (PM). Different Fermi surfaces were obtained for the AF, PM, and PPM states. Due to band folding, a large number of branches was expected and observed in the AF state. The LDA+U calculation was compared with the previous LDA calculations. Furthermore, we compared both calculations with previously published de Haas–van Alphen experiments. The better agreement with the LDA approach suggests that above the critical pressure pc CeRh2Si2 enters in a mixed-valence state. In the PPM state under a high magnetic field, the 4f contribution at the Fermi level EF drops significantly compared with that in the PM state, and the 4f electrons contribute only weakly to the Fermi surface in our approach.
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Dates et versions

hal-02069734 , version 1 (06-01-2025)

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Alexandre Pourret, Michi-To Suzuki, Alexandra Palaccio Morales, Gabriel Seyfarth, Georg Knebel, et al.. Fermi Surfaces in the Antiferromagnetic, Paramagnetic and Polarized Paramagnetic States of CeRh 2 Si 2 Compared with Quantum Oscillation Experiments. Journal of the Physical Society of Japan, 2017, 86 (8), pp.084702. ⟨10.7566/JPSJ.86.084702⟩. ⟨hal-02069734⟩
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