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Phase separation in La-Ca manganites: Magnetic field effects

Abstract

The coexistence of magnetic phases seems to be a characteristic of the La-Ca family of in colossal magnetoresistant manganites. We have analyzed this phenomenon in terms of a free energy, F, where magnetic and electronic contributions of two coexistent phases are included. Three order parameters describe the behavior of the mixed material: the magnetization of each phase and the metallic fraction. Due to the coupling between order parameters there is a range: T**{<=}T{<=}T* where coexistence is possible. Values for the phenomenological parameters are obtained from the experiment. In this paper we analyze the effects of an applied magnetic field on the range of T where the phase coexistence takes place, based on results obtained from dc-magnetization and ESR measurements.
Authors:
Tovar, M; Causa, M T; [1]  Ramos, C.A. , E-mail: cramos@cab.cnea.gov.ar; [1]  Laura-Ccahuana, D; [1]  Universidad Nacional de Ingenieria, Av. Tupac Amaru 210, Rimac/Lima 25 (Peru)]
  1. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica and Universidad Nacional de Cuyo, 8400 San Carlos de Bariloche, Rio Negro (Argentina)
Publication Date:
Feb 15, 2008
Product Type:
Journal Article
Resource Relation:
Journal Name: Journal of Magnetism and Magnetic Materials; Journal Volume: 320; Journal Issue: 3-4; Other Information: DOI: 10.1016/j.jmmm.2007.07.013; PII: S0304-8853(07)00813-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Subject:
36 MATERIALS SCIENCE; CALCIUM COMPOUNDS; ELECTRON SPIN RESONANCE; FREE ENERGY; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MAGNETIZATION; MANGANESE COMPOUNDS; ORDER PARAMETERS; OXIDES
OSTI ID:
21045298
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0304-8853; JMMMDC; TRN: NL08R2765063977
Availability:
Available from http://dx.doi.org/10.1016/j.jmmm.2007.07.013;INIS
Submitting Site:
NLN
Size:
page(s) 523-527
Announcement Date:
Aug 05, 2008

Citation Formats

Tovar, M, Causa, M T, Ramos, C.A. , E-mail: cramos@cab.cnea.gov.ar, Laura-Ccahuana, D, and Universidad Nacional de Ingenieria, Av. Tupac Amaru 210, Rimac/Lima 25 (Peru)]. Phase separation in La-Ca manganites: Magnetic field effects. Netherlands: N. p., 2008. Web. doi:10.1016/j.jmmm.2007.07.013.
Tovar, M, Causa, M T, Ramos, C.A. , E-mail: cramos@cab.cnea.gov.ar, Laura-Ccahuana, D, & Universidad Nacional de Ingenieria, Av. Tupac Amaru 210, Rimac/Lima 25 (Peru)]. Phase separation in La-Ca manganites: Magnetic field effects. Netherlands. doi:10.1016/j.jmmm.2007.07.013.
Tovar, M, Causa, M T, Ramos, C.A. , E-mail: cramos@cab.cnea.gov.ar, Laura-Ccahuana, D, and Universidad Nacional de Ingenieria, Av. Tupac Amaru 210, Rimac/Lima 25 (Peru)]. 2008. "Phase separation in La-Ca manganites: Magnetic field effects." Netherlands. doi:10.1016/j.jmmm.2007.07.013. https://www.osti.gov/servlets/purl/10.1016/j.jmmm.2007.07.013.
@misc{etde_21045298,
title = {Phase separation in La-Ca manganites: Magnetic field effects}
author = {Tovar, M, Causa, M T, Ramos, C.A. , E-mail: cramos@cab.cnea.gov.ar, Laura-Ccahuana, D, and Universidad Nacional de Ingenieria, Av. Tupac Amaru 210, Rimac/Lima 25 (Peru)]}
abstractNote = {The coexistence of magnetic phases seems to be a characteristic of the La-Ca family of in colossal magnetoresistant manganites. We have analyzed this phenomenon in terms of a free energy, F, where magnetic and electronic contributions of two coexistent phases are included. Three order parameters describe the behavior of the mixed material: the magnetization of each phase and the metallic fraction. Due to the coupling between order parameters there is a range: T**{<=}T{<=}T* where coexistence is possible. Values for the phenomenological parameters are obtained from the experiment. In this paper we analyze the effects of an applied magnetic field on the range of T where the phase coexistence takes place, based on results obtained from dc-magnetization and ESR measurements.}
doi = {10.1016/j.jmmm.2007.07.013}
journal = {Journal of Magnetism and Magnetic Materials}
issue = {3-4}
volume = {320}
place = {Netherlands}
year = {2008}
month = {Feb}
}