Influence of oxygen vacancies on magnetoresistance properties of bulk La0.67Ca0.33MnO3-δ

被引：56
作者：
Hossain, AKMA
Cohen, LF
Kodenkandeth, T
MacManus-Driscoll, J
Alford, NM
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England
[3] S Bank Univ, London SE1 0AA, England
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1999年 / 195卷 / 01期
基金：
英国工程与自然科学研究理事会;
关键词：
colossal magnetoresistance; grain boundaries; oxygen vacancies; grain size; transition temperature;
D O I：
10.1016/S0304-8853(98)00749-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Bulk polycrystalline samples of La0.67Ca0.33MnO3-delta were annealed in controlled oxygen atmospheres. Two types of conditions were chosen, firstly with the aim of taking oxygen from the grain boundaries and secondly with the aim of removing oxygen uniformly from the sample. Reducing conditions increase the overall resistivity and suppress the Curie-Weiss temperature (T-c). A second peak at temperatures below T-c appears in the resistivity and magnetoresistivity when the samples are deoxygenated. However, the presence of this peak does not strongly influence the low-temperature magnetoresistance. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：31 / 36
页数：6
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