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|Type:||Artigo de periódico|
|Title:||Disorder effects at low temperatures in La0.7-xYxCa0.3MnO3 manganites|
de Lima, OF
|Abstract:||With the aim of probing the effect of magnetic disorder in the low-temperature excitations of manganites, specific heat measurements were per-formed in zero field, and in magnetic fields up to 9 T 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. (C) 2003 Elsevier Ltd. All rights reserved.|
|Editor:||Pergamon-elsevier Science Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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