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

页码：31 / 36

页数：6

共 15 条

[1] Non-stoichiometry and properties of mixed-valence manganites
Alonso, JA
[J]. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1998, 356 (1742): : 1617 - 1632
[2] OXYGEN CHEMICAL DIFFUSION IN STRONTIUM DOPED LANTHANUM MANGANITES
BELZNER, A
GUR, TM
HUGGINS, RA
[J]. SOLID STATE IONICS, 1992, 57 (3-4) : 327 - 337
[3] Claire A. D. L., 1963, BR J APPL PHYS, V14, P351
[4] Influence of controlled oxygen vacancies on the magnetotransport and magnetostructural phenomena in La0.85Sr0.15MnO3-delta single crystals
DeLeonGuevara, AM
Berthet, P
Berthon, J
Millot, F
Revcolevschi, A
Anane, A
Dupas, C
LeDang, K
Renard, JP
Veillet, P
[J]. PHYSICAL REVIEW B, 1997, 56 (10) : 6031 - 6035
[5] Colossal magnetoresistance of ferromagnetic manganites: Structural tuning and mechanisms
Fontcuberta, J
Martinez, B
Seffar, A
Pinol, S
GarciaMunoz, JL
Obradors, X
[J]. PHYSICAL REVIEW LETTERS, 1996, 76 (07) : 1122 - 1125
[6] Hossain AKMA, 1999, J MAGN MAGN MATER, V192, P263, DOI 10.1016/S0304-8853(98)00530-7
[7] Spin-polarized intergrain tunneling in La-2/Sr-3(1)/3MnO3
Hwang, HY
Cheong, SW
Ong, NP
Batlogg, B
[J]. PHYSICAL REVIEW LETTERS, 1996, 77 (10) : 2041 - 2044
[8] SPIRAL STATE AND GIANT MAGNETORESISTANCE IN PEROVSKITE MN OXIDES
INOUE, J
MAEKAWA, S
[J]. PHYSICAL REVIEW LETTERS, 1995, 74 (17) : 3407 - 3410
[9] DEPENDENCE OF GIANT MAGNETORESISTANCE ON OXYGEN STOICHIOMETRY AND MAGNETIZATION IN POLYCRYSTALLINE LA0.67BA0.33MNOZ
JU, HL
GOPALAKRISHNAN, J
PENG, JL
LI, Q
XIONG, GC
VENKATESAN, T
GREENE, RL
[J]. PHYSICAL REVIEW B, 1995, 51 (09): : 6143 - 6146
[10] AVERAGE GRAIN SIZE IN POLYCRYSTALLINE CERAMICS
MENDELSON, MI
[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1969, 52 (08) : 443 - +

← 1 2 →