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Type: Artigo de periódico
Title: Disorder Effects At Low Temperatures In La0.7-xy Xca0.3mno3 Manganites
Author: Gusmao M.A.
Ghivelder L.
Freitas R.S.
Ribeiro R.A.
De Lima O.F.
Damay F.
Cohen L.F.
Abstract: With the aim of probing the effect of magnetic disorder in the low-temperature excitations of manganites, specific heat measurements were performed in zero field, and in magnetic fields up to 9T in polycrystalline samples of La0.7-xYxCa0.3MnO3, with Y concentrations x=0, 0.10, and 0.15. Yttrium doping yielded the appearance of a cluster-glass state, giving rise to unusual low-temperature behavior of the specific heat. The main feature observed in the results is a strong enhancement of the specific heat linear term, which is interpreted as a direct consequence of magnetic disorder. The analysis was further corroborated by resistivity measurements in the same compounds. © 2003 Elsevier Ltd. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0038-1098(03)00511-8
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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