Decoupling between Field-Instabilities of Antiferromagnetism and Pseudo-Metamagnetism in Rh-Doped CeRu2Si2 Kondo Lattice

D. Aoki (1) , Carley Paulsen (2) , H. Kotegawa (1, 3) , F. Hardy (4) , C. Meingast (4) , Pierre Haen (2) , M. Boukahil (1) , William Knafo (5) , E. Ressouche (1) , S. Raymond (1, 6) , J. Flouquet (1)

1 SPSMS - UMR 9001 - Service de Physique Statistique, Magnétisme et Supraconductivité
2 NEEL - MagSup - Magnétisme et Supraconductivité
3 Konan University [Kobe, Japan]
4 KIT - Karlsruher Institut für Technologie
5 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
6 ILL - Institut Laue-Langevin

Doping Kondo lattice system CeRu 2 Si 2 with Rh-8% (Ce(Ru 0.92 Rh 0.08 ) 2 Si 2 ) leads to drastic consequences due to the mismatch of the lattice parameters between CeRu 2 Si 2 and CeRh 2 Si 2 . A large variety of experiments clarifies the unusual properties of the ground state induced by the magnetic field from longitudinal antiferromagnetic (AF) mode at H =0 to polarized paramagnetic phase in very high magnetic field. The separation between AF phase, paramagnetic phase and polarized paramagnetic phase varying with temperature, magnetic field and pressure is discussed on the basis of the experiments down to very low temperature. Similarities and differences between Rh and La substituted alloys are discussed with emphasis on the competition between transverse and longitudinal AF modes, and ferromagnetic fluctuations

Mots clés: CeRu2Si2; Rh-doping; La-doping; antiferromagnetism; pseudo-metamagnetism; specific heat; resistivity; thermal expansion; magnetization; neutron diffraction; high pressure

Domaines: Science des matériaux [cond-mat.mtrl-sci]

D. Aoki, Carley Paulsen, H. Kotegawa, F. Hardy, C. Meingast, et al.. Decoupling between Field-Instabilities of Antiferromagnetism and Pseudo-Metamagnetism in Rh-Doped CeRu2Si2 Kondo Lattice. Journal of the Physical Society of Japan, 2012, 81, pp.034711. ⟨10.1143/JPSJ.81.034711⟩. ⟨hal-00687169⟩