Mn-site doping effects in the giant magnetoresistive perovskite La2/3Ca1/3MnO3:: An EPR investigation

被引：0
作者：
Giurgiu, LV
Grecu, MN
Filip, X
Darabont, A
Indrea, E
Deac, IG
Filip, C
Ordean, R
Popescu, GD
Surducan, E
Blasco, J
Papavassiliou, G
机构：
[1] Natl Inst Res & Dev Isotop & Mol Technol, R-3400 Cluj Napoca, Romania
[2] Natl Inst Mat Phys, Bucharest 76900, Romania
[3] Univ Babes Bolyai, Fac Phys, R-3400 Cluj Napoca, Romania
[4] Univ Zaragoza, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
[5] Demokritos Natl Ctr Sci Res, Inst Sci Mat, GR-15310 Athens, Greece
来源：
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS | 2000年 / 2卷 / 04期
关键词：
exchange interaction; EPR; aluminium doping; magnetoresistive perovskites;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of aluminium doping on Mn site in the magnetoresistive La-2/3 Ca-1/3 Mn1-x, AlxO3 (x less than or equal to 0.05) powders have been investigated by EPR. The temperature and x dependence of the resonance linewidth has been investigated and discussed in terms of exchange narrowing and spin-lattice relaxation. In the paramagnetic regime, the exchange coupling integral, J, between Mn3+ and Mn4+ ions shows a decrease with increasing x. it could arises from weakening of the double-exchange interaction by aluminium doping which reduces the exchange field at the Mn sites.
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页码：375 / 378
页数：4
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