期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 326, 期 1-2, 页码 270-274出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-8388(01)01319-6
关键词
manganite; spacer layer; multilayer; magnetoresistance; double exchange
Multilayers of perovskite manganite oxides La0.67Ca0.33MnO3/Pr0.7Ca0.3MnO3,La0.67Ca0.33MnO3/LaMnO3 have been fabricated by pulsed laser deposition. Maganetoresistance (defining R(0)-R(H)/R(0)) of 98% has been observed in multilayers with Pr0.7Ca0.3MnO3 as the spacer layer. No enhancement is observed in multilayers with LaMnO3 as the spacer layer. Enhanced magnetoresistance in La0.67Ca0.33MnO3/Pr0.7Ca0.3MnO3 multilayers is explained on the basis of induced double exchange in the Pr0.7Ca0.3MnO3 layer as Mn exists both in 3+ and 4+ states. Such a facility does not exist in La0.67Ca0.33MnO3/LaMnO3 as Mn is present only in the 3+ state in LaMnO3. (C) 2001 Elsevier Science BY. All rights reserved.
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