Anomalous post-annealing effects on magnetic and electrical properties of La0.8Ca0.2MnO3

Chang Seop Hong; Wan Seop Kim; Nam Hwi Hur

doi:10.1016/S0038-1098(01)00413-6

Anomalous post-annealing effects on magnetic and electrical properties of La_0.8Ca_0.2MnO₃

Chang Seop Hong, Wan Seop Kim, Nam Hwi Hur

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We report anomalous post-annealing effects of La_0.8Ca_0.2MnO₃ under O₂ and Ar atmospheres. We have found that the critical temperature (T_C) of the as-prepared sample increases after Ar-annealing and decreases upon O₂ annealing. The temperature-dependent magnetization data of the as-prepared compound agree well with the sum of those of the O₂- and Ar-annealed samples. Colossal magnetoresistance (CMR) below 60 K that reaches to almost 100% is observed in the O₂-annealed sample. These unusual results are discussed in terms of global homogenization over the sample and magnetic inhomogeneity induced by the Mn deficiency.

Original language	English
Pages (from-to)	359-362
Number of pages	4
Journal	Solid State Communications
Volume	120
Issue number	9-10
DOIs	https://doi.org/10.1016/S0038-1098(01)00413-6
Publication status	Published - 2001 Nov 2
Externally published	Yes

Keywords

A. Magnetically orderd materials
A. Perovskite Manganites
D. Colossal magnetoresistance

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/S0038-1098(01)00413-6

Cite this

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title = "Anomalous post-annealing effects on magnetic and electrical properties of La0.8Ca0.2MnO3",

abstract = "We report anomalous post-annealing effects of La0.8Ca0.2MnO3 under O2 and Ar atmospheres. We have found that the critical temperature (TC) of the as-prepared sample increases after Ar-annealing and decreases upon O2 annealing. The temperature-dependent magnetization data of the as-prepared compound agree well with the sum of those of the O2- and Ar-annealed samples. Colossal magnetoresistance (CMR) below 60 K that reaches to almost 100% is observed in the O2-annealed sample. These unusual results are discussed in terms of global homogenization over the sample and magnetic inhomogeneity induced by the Mn deficiency.",

keywords = "A. Magnetically orderd materials, A. Perovskite Manganites, D. Colossal magnetoresistance",

author = "Hong, {Chang Seop} and Kim, {Wan Seop} and Hur, {Nam Hwi}",

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T1 - Anomalous post-annealing effects on magnetic and electrical properties of La0.8Ca0.2MnO3

AU - Hong, Chang Seop

AU - Kim, Wan Seop

AU - Hur, Nam Hwi

PY - 2001/11/2

Y1 - 2001/11/2

N2 - We report anomalous post-annealing effects of La0.8Ca0.2MnO3 under O2 and Ar atmospheres. We have found that the critical temperature (TC) of the as-prepared sample increases after Ar-annealing and decreases upon O2 annealing. The temperature-dependent magnetization data of the as-prepared compound agree well with the sum of those of the O2- and Ar-annealed samples. Colossal magnetoresistance (CMR) below 60 K that reaches to almost 100% is observed in the O2-annealed sample. These unusual results are discussed in terms of global homogenization over the sample and magnetic inhomogeneity induced by the Mn deficiency.

AB - We report anomalous post-annealing effects of La0.8Ca0.2MnO3 under O2 and Ar atmospheres. We have found that the critical temperature (TC) of the as-prepared sample increases after Ar-annealing and decreases upon O2 annealing. The temperature-dependent magnetization data of the as-prepared compound agree well with the sum of those of the O2- and Ar-annealed samples. Colossal magnetoresistance (CMR) below 60 K that reaches to almost 100% is observed in the O2-annealed sample. These unusual results are discussed in terms of global homogenization over the sample and magnetic inhomogeneity induced by the Mn deficiency.

KW - A. Magnetically orderd materials

KW - A. Perovskite Manganites

KW - D. Colossal magnetoresistance

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DO - 10.1016/S0038-1098(01)00413-6

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SN - 0038-1098

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SP - 359

EP - 362

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