Spin fluctuation effects in substituted CeRu2Si2 and YbPd2Si2 alloys

Umarji, A. M. ; Godart, C. ; Gupta, L. C. ; Vijayaraghavan, R. (1986) Spin fluctuation effects in substituted CeRu2Si2 and YbPd2Si2 alloys Pramana - Journal of Physics, 27 (1-2). pp. 321-329. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/27/1-2/321-...

Related URL: http://dx.doi.org/10.1007/BF02846346


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−x Gex and YbPd2Si2−x Gex. 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−x Gex 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−xOsx Si2 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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Spin Fluctuation; Chemical Pressure Effect; Mixed Valence; Magnetic Susceptibility
ID Code:61665
Deposited On:15 Sep 2011 11:40
Last Modified:18 May 2016 11:16

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