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Type: Artigo de periódico
Title: Disorder effects at low temperatures in La0.7-xYxCa0.3MnO3 manganites
Author: Gusmao, MA
Ghivelder, L
Freitas, RS
Ribeiro, RA
de Lima, OF
Damay, F
Cohen, LF
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.
Subject: disordered systems
heat capacity
electronic transport
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
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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