Fermi surfaces in the antiferromagnetic, paramagnetic and polarized paramagnetic states of CeRh2Si2 compared with quantum oscillation experiments

Alexandre Pourret, Michi To Suzuki, Alexandra Palaccio Morales, Gabriel Seyfarth, Georg Knebel, Dai Aoki, Jacques Flouquet

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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 4 f 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.

Original languageEnglish
Article number084702
Journaljournal of the physical society of japan
Volume86
Issue number8
DOIs
Publication statusPublished - 2017 Aug 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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