Magnetic ordering and the Kondo effect in the alloys, Ce2Co1−xPdxSi3

Majumdar, Subham ; Sampathkumaran, E. V. (2001) Magnetic ordering and the Kondo effect in the alloys, Ce2Co1−xPdxSi3 Journal of Magnetism and Magnetic Materials, 223 (3). pp. 247-252. ISSN 0304-8853

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03048...

Related URL: http://dx.doi.org/10.1016/S0304-8853(00)01266-X

Abstract

The compound Ce2CoSi3, crystallizing in a AlB2-derived hexagonal structure, has been recently identified as a Kondo lattice with a non-magnetic ground state. Here, we report the influence of gradual replacement of Co by Pd on the magnetic behaviour in the pseudo-ternary solid solution, Ce2Co1−xPdxSi3, by magnetization (2-300 K), electrical resistivity (2-300 K) and heat-capacity (0.7-30 K) measurements to bring out a transformation from non-magnetic to magnetic ordering. Distinct features attributable to the existence of a competition between the Kondo effect and magnetic ordering with varying x and temperature are observed in the electrical resistivity data. The results reveal that small substitutions of Pd (x=0.2-0.3) are sufficient to induce magnetic ordering of the Ce ions at low temperatures. The strength of the Kondo interaction as indicated by the paramagnetic Curie temperature decreases monotonically with increasing Pd content. A notable finding is that there are qualitative changes in the isothermal magnetization data in the magnetically ordered state, as if there are modifications in the magnetic structure with changes in the Co/Pd composition. The importance of electronic structure relative to unit-cell volume in deciding magnetic characteristics of this class of compounds is brought out taking into account the trends in the magnetic behaviour of isostructural Ce compounds.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Kondo Effect; Magnetic Ordering
ID Code:45704
Deposited On:29 Jun 2011 03:25
Last Modified:29 Jun 2011 03:25

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