TY - JOUR
T1 - Quantum criticality and lifshitz transition in the ising system CeRu2Si2
T2 - Comparison with YbRh2Si2
AU - Pourret, Alexandre
AU - Aoki, Dai
AU - Boukahil, Mounir
AU - Brison, Jean Pascal
AU - Knafo, William
AU - Knebel, Georg
AU - Raymond, Stephane
AU - Taupin, Mathieu
AU - Ônuki, Yoshichika
AU - Flouquet, Jacques
N1 - Publisher Copyright:
© 2014 The Physical Society of Japan.
PY - 2014/6/15
Y1 - 2014/6/15
N2 - 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.
AB - 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.
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U2 - 10.7566/JPSJ.83.061002
DO - 10.7566/JPSJ.83.061002
M3 - Article
AN - SCOPUS:84904704225
VL - 83
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 6
M1 - 061002
ER -