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Type: Artigo de periódico
Title: Effect Of Zn Substitution On Para- To Ferromagnetic Transition Temperature In La0.67ca0.33mn1-xznxo3 Colossal Magnetoresistance Materials
Author: Awana V.P.S.
Schmitt E.
Gmelin E.
Gupta A.
Sedky A.
Narlikar A.V.
De Lima O.F.
Cardoso C.A.
Malik S.K.
Yelon W.B.
Abstract: Structural, magnetic, and thermal measurements are carried out on the La0.67Ca0.33Mn1-xZnxO3 system with x = 0.0-0.50. The structural characterization of the samples is done by Rietveld analysis of their neutron diffraction patterns. Zn substitutes at Mn site isostructurally until x =0.30. Oxygen content remains nearly invariant with x. Magnetic and thermal measurements as well as the electrical resistance show a para-to-ferromagnetic transition at Tp, which decreases with an increase of x. For low Zn concentration (until x=0.075) the decrease dTp/dx is smaller than for the larger concentrations of Zn. Relative decrease dTp/dx at higher concentrations (x>0.10) is similar to that observed earlier for the La0.67Ca0.33Mn1-xFexO3 system. For the transition at Tp, the related change of magnetic entropy (ΔStrs) are calculated from the heat capacity data and indicate that for x=0 the expected value ΔStrs=12.8 J/mol K is recovered. © 2000 American Institute of Physics.
Rights: aberto
Identifier DOI: 
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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