Localization of 4f State in YbRh_2Si_2 under Magnetic Field and High Pressure : Comparison with CeRh_2Si_2(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• We present detailed measurements of the electrical resistivity and microcalorimetry under magnetic field and high pressure which confirm the proximity of YbRh_2Si_2 to a quantum critical point at ambient pressure. Our data seems to rule out the divergence of the heavy quasiparticle mass at the magnetic field tuned quantum critical point. Further Mossbauer spectroscopy gives evidence that the observed ESR resonance cannot be assigned directly to the trivalent Yb local spin dynamics. We report for the first time on quantum oscillations in YbRh_2Si_2. The obtained angular dependence is compared with band-structure calculation. A significant change of the resistivity and specific heat under high pressure and magnetic field is observed. Above 5 GPa ferromagnetic coupling plays the dominant role. The unusual high pressure phase diagram of YbRh_2Si_2 cannot be explained in term of the Doniach phase diagram. In Yb heavy fermion case, slow valence fluctuations may occur due to an occupation number of the trivalent state which differs notably from unity. The differences between the Ce and Yb heavy fermion systems are discussed. In particular a comparison is made between CeRh_2Si_2 and YbRh_2Si_2. The observed field and pressure variations of the Hall voltage in CeRh_2Si_2 are not straightforwardly linked to the change in the Fermi surface topology. A tiny change in the 4f electron occupation number will have a huge effect on the effective mass of different orbits of the complex band structure and thus on the Hall effect in this multiband electronic structure. A similar scenario must be certainly considered for YbRh_2Si_2.

• 社団法人日本物理学会の論文
• 2006-11-15

著者

• Flouquet Jacques

  Inac Spsms Imapec Cea-grenoble

• Bonville P.

  Departement De Recherche Sur L'etat Condense Les Atomes Et Les Molecules

• Lapertot G.

  Inac Spsms Imapec Cea-grenoble

• HARIMA H.

  Department of Physics, Kobe University

• Flouquet J

  C.r.t.b.t.

• Knebel Georg

  Inac Spsms Imapec Cea-grenoble

• Sheikin I.

  Grenoble High Magnetic Field Laboratory

• KNEBEL G.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• BOURSIER R.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• HASSINGER E.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• LAPERTOT G.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• NIKLOWITZ P.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• POURRET A.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• SALCE B.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• SANCHEZ J.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• FLOUQUET J.

  Departement de la Recherche Fondamentale sur la Matiere Condensee

• Knebel G.

  INAC SPSMS IMAPEC, CEA-Grenoble

• Flouquet J.

  INAC SPSMS IMAPEC, CEA-Grenoble

• Salce B.

  Cea: Departement Sur La Matiere Condensee

• Flouquet J.

  Inac Spsms Imapec Cea-grenoble

• Boursier Rodolphe

  Departement De La Recherche Fondamentale Sur La Matiere Condensee

• Hassinger E.

  Cea: Departement Sur La Matiere Condensee

• Sheikin I.

  Grenoble High Magnetic Field Lab. Grenoble Fra

• Sanchez J.

  Departamento De Anatomia Anatomia Patologica Comparadas Y Tecnologia De Los Alimentos Histologia Y A

• Harima H.

  Department Of Physics Faculty Of Science Kobe Univ.

• Harima H.

  Department Of Physics Kobe University

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