Anomalous oxygen annealing effects on La0.7Ca0.3MnO3 films grown on MgO substrates

被引：11

作者：

Choi, HS ^{[1
]}

Kim, WS ^{[1
]}

Nam, BC ^{[1
]}

Hur, NH ^{[1
]}

机构：

[1] Korea Res Inst Stand & Sci, Ctr CMR Mat, Taejon 305600, South Korea

来源：

APPLIED PHYSICS LETTERS | 2001年 / 78卷 / 03期

关键词：

D O I：

10.1063/1.1338972

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Epitaxial La0.7Ca0.3MnO3 thin films were grown on MgO (001) substrates by pulsed laser deposition. The as-grown films exhibit a metal-insulator transition at temperatures ranging from 200 to 230 K. Surprisingly, the transition temperature of postannealed films under O-2 at 900 degreesC decreases by more than 100 K, featured with the colossal magnetoresistance. The O-2 annealed films also show thermal hysteresis in resistivity and nonlinear I-V behavior. These results are interpreted in terms of Mn deficiency induced by large structural difference between film and substrate, and also discussed in viewpoint of a percolative phase transition. (C) 2001 American Institute of Physics.

引用

页码：353 / 355

页数：3

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