Quantum criticality and lifshitz transition in the ising system CeRu2Si2: Comparison with YbRh2Si2

Alexandre Pourret, Dai Aoki, Mounir Boukahil, Jean Pascal Brison, William Knafo, Georg Knebel, Stephane Raymond, Mathieu Taupin, Yoshichika Ônuki, Jacques Flouquet

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


New thermoelectric power (TEP) measurements on prototype heavy-fermion compounds close to magnetic quantum criticality are presented. The highly sensitive technique of TEP is an unique tool to reveal Fermi surface instabilities, referred here as Lifshitz transitions. The first focus is on the Ising CeRu2Si2 series. Doping CeRu2Si2 with Rh produces a decoupling between the first order metamagnetic transition and the pseudo-metamagnetism observed in the pure compound. Comparison is made with the case of YbRh2Si2 which is often considered as the archetype of local quantum criticality by contrast to CeRu2.Si2, taken as an example of spin-density wave criticality. Up to now for ferromagnetic materials showing ferromagnetic wings, no simple case appears where the Fermi surface is preserved between the ferromagnetic and paramagnetic phases. An open issue is the consequence of Lifshitz transitions on superconductivity in these multiband systems.

Original languageEnglish
Article number061002
Journaljournal of the physical society of japan
Issue number6
Publication statusPublished - 2014 Jun 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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