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Type: Artigo de periódico
Title: Abrupt field-induced transition triggered by magnetocaloric effect in phase-separated manganites
Author: Ghivelder, L
Freitas, RS
das Virgens, MG
Continentino, MA
Martinho, H
Granja, L
Quintero, M
Leyva, G
Levy, P
Parisi, F
Abstract: The occurrence at low temperatures of an ultrasharp field-induced transition in phase-separated manganites is analyzed. Experimental results show that magnetization and specific-heat steplike transitions below 5 K are correlated with an abrupt change of the sample temperature, which happens at a certain critical field. This temperature rise, a magnetocaloric effect, is interpreted as produced by the released energy at the transition point and is the key to understand the existence of the abrupt field-induced transition. A qualitative analysis of the results suggests the existence of a critical growing rate of the ferromagnetic phase, beyond which an avalanche effect is triggered.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.69.214414
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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