Ferromagnetic-antiferromagnetic transition and resistivity variation of oxygen-deficient La0.5Ca0.5MnO3 samples

被引：2
|
作者：
Ma Yu-Bin [1 ]
机构：
[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
来源：
ACTA PHYSICA SINICA | 2009年 / 58卷 / 07期
关键词：
La0.5Ca0.5MnO3; antiferromagnetic phase transition; ferromagnetic phase transition; deoxygenation; DOUBLE-EXCHANGE; PHASE; MAGNETORESISTANCE; CHARGE; TEMPERATURE; FIELD;
D O I：
10.7498/aps.58.4976
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated the influence of oxygen vacancies on electronic transport and magnetic property of polycrystalline bulk La0.5Ca0.5MnO3 (LCMO). With increasing content of oxygen vacancy, its resistivity at high temperature increases monotonically and follows the adiabatic small-polaron model. The resistivity at low temperature first deereases, then increases, and has the behavior of d R/dT > 0 evidently. The resistivity at low temperature becomes insulating at last. Increasing the oxygen vacancies depresses the appearance of antiferromagnetic phase. As a result, antiferromagnetic transition does not occurs in oxygen-deficient LCMO samples. On more increase of oxygen vacancies, ferromagnetic phase will eventually be suppressed.
引用
收藏
页码：4976 / 4979
页数：4
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