Orbital order and anisotropic transport properties in doped manganites induced by epitaxial coherency strain

被引:20
作者
Klein, J [1 ]
Philipp, JB [1 ]
Reisinger, D [1 ]
Opel, M [1 ]
Marx, A [1 ]
Erb, A [1 ]
Alff, L [1 ]
Gross, R [1 ]
机构
[1] Bayer Akad Wissensch, Walther Meissner Inst, D-85748 Garching, Germany
关键词
D O I
10.1063/1.1555366
中图分类号
O59 [应用物理学];
学科分类号
摘要
Epitaxial coherency strain is a crucial parameter strongly influencing the complex interplay between structure as well as spin, charge, and orbital degrees of freedom in the doped manganites. We have grown epitaxial manganite thin films on various substrates using ultrahigh vacuum laser molecular beam epitaxy with RHEED control. In order to study transport perpendicular to the film plane, mesa structures have been fabricated into the epitaxial films. For coherently strained La2/3Ca1/3MnO3 and La2/3Ba1/3MnO3 thin films grown on SrTiO3 and NdGaO3 substrates, an unusual transport anisotropy is observed. Whereas metallic behavior is found within the plane of biaxial coherency strain, for transport perpendicular to this plane an insulating behavior and nonlinear current-voltage characteristics are observed. This behavior can be interpreted in terms of a strain induced orbital order effect at fixed doping. Our results demonstrate the effect of epitaxial coherency strain in heterostructures required for magnetoelectronic devices. (C) 2003 American Institute of Physics.
引用
收藏
页码:7373 / 7375
页数:3
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