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      https://www.ias.ac.in/article/fulltext/pram/027/01-02/0321-0329

    • Keywords

       

      Spin fluctuation; chemical pressure effect; mixed valence; magnetic susceptibility

    • Abstract

       

      Effects of chemical substitution in CeRu2Si2, a well-studied heavy fermion system and YbPd2Si2 have been investigated through magnetic susceptibility and x-ray diffraction in the systems CeRuxSi2, CeRu2−xOsxSi2, CeRu2Si2−xGex and YbPd2Si2−xGex. Replacing silicon by germanium generates normal chemical pressure effect, namely, Ce and Yb atoms in CeRu2Si2 and YbPd2Si2 became more and less magnetic respectively. With increasing Ge concentration, CeRu2Si2−xGex exhibits larger susceptibility at low temperature, goes to an antiferromagnetic state and finally becomes ferromagnetic. In YbPd2Si2−xGex, increasing Ge concentration drives Yb atoms to more divalent state. Electronic effects are more pronounced in CeRu2−xOsxSi2 though CeRu2Si2 and CeOs2Si2 have very nearly the same lattice parameters. It is conjectured that CeRu2Si2−xGex may be the first Ce-based heavy fermion having a magnetic ground state.

    • Author Affiliations

       

      A M Umarji1 C Godart1 2 L C Gupta1 R Vijayaraghavan1

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay - 400 005
      2. CNRS, ER 209, Chimie Metallurgique des Terres Rares, 92, Meudon, France
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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