Appearance of an inhomogeneous superconducting state in La0.67Sr0.33MnO3-YBa2Cu3O7-La0.67Sr0.33MnO3 trilayers

被引：0
|
作者：
K. Senapati
R. C. Budhani
机构：
[1] Indian Institute of Technology Kanpur,Department of Physics
来源：
Pramana | 2007年 / 69卷
关键词：
Proximity effect; inhomogeneous superconductivity; 74.45.+c; 74.78.Fk; 74.81.-g;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
An experimental study of proximity effect in La0.67Sr0.33MnO3-YBa2CU3O7-La0.67Sr0.33MnO3 trilayers is reported. Transport measurements on these samples show clear oscillations in critical current (Ic) as the thickness of La0.67Sr0.33MnO3 layers (dF) is scanned from ∼50 Å to ∼ 1100 Å. In the light of existing theories of ferromagnet-superconductor (FM-SC) heterostructures, this observation suggests a long range proximity effect in the manganite, modulated by its weak exchange energy (∼2 meV). The observed modulation of the magnetic coupling between the ferromagnetic LSMO layers as a function of dF, also suggests an oscillatory behavior of the SC order parameter near the FM-SC interface.
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页码：267 / 275
页数：8
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