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Pressure-induced magnetic phase transitions in Yb Kondo lattice systems

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Abstract

In this paper we give a brief overview of the effect of pressure on the magnetic and electronic properties of Yb Kondo lattices using the 170Yb Mössbauer technique, electrical resistance and X-ray diffraction. The selected materials were either nonmagnetic (YbCu2Si2 and Yb2Ni2Al) or ferromagnetic (YbNiSn). We show that pressure induces a first order transition to a magnetic ground state in both YbCu2Si2 and Yb2Ni2Al. In the former compound, the transition is accompanied by a valence change towards Yb3+ state. The behavior of both YbCu2Si2 and Yb2Ni2Al can be understood as resulting from a pressure enhancement of the RKKY interaction which finally dominates the Kondo effect. We demonstrate that the ground state properties of YbNiSn are governed by a volume dependent competition between anisotropic exchange interactions and crystal field anisotropy rather than by a direct competition between Kondo and RKKY interactions.

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Authors and Affiliations

  1. Département de Recherche Fondamentale sur la Matière Condensée, CEA/Grenoble, 17 rue des Martyrs, F-38054, Grenoble Cedex 9, France

    J.P. Sanchez

  2. II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937, Köln, Germany

    M.M. Abd-Elmeguid

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Sanchez, J., Abd-Elmeguid, M. Pressure-induced magnetic phase transitions in Yb Kondo lattice systems. Hyperfine Interactions 128, 137–150 (2000). https://doi.org/10.1023/A:1012627414473

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