Extrinsic magneto resistance in La2/3Ca1/3MnO3 thick films

被引：3
作者：
Hart, C
Hernández, AD
Arés, O
Escudero, R
机构：
[1] Havanna Univ, Superconduct IMRE, Superconduct Lab, Havana 10400, Cuba
[2] Univ Nacl Autonoma Mexico, Mat Res Inst, Low Temperature Lab, Mexico City, DF, Mexico
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 226卷 / 226-230期
关键词：
manganites; extrinsic magnetoresistance; tunneling magnetoresistance;
D O I：
10.1016/S0304-8853(00)00671-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Thick films of La0.66Ca0.33MnO3 have been obtained on alumina substrate by the "paint-on" method. They exhibit a clear extrinsic magneto resistance (broad metal-insulator transition with peak temperature lower than Curie temperature, magneto resistance at low temperatures and magnetic fields. etc.). This behavior seems to be related to the competition between tunneling magnetoresistance (TMR) at the grain boundaries and double exchange in the grains. An anomaly is observed in the resistance vs. applied magnetic field at low temperatures. which support the presence of TMR. EDAX analysis performed to the films shows elemental composition deviations near to the grain boundaries. (C) 2001 Published by Elsevier Science B.V.
引用
收藏
页码：905 / 907
页数：3
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