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 and thin films grown on and 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.
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15 May 2003
47th Annual Conference on Magnetism & Magnetic Materials
11-15 November 2002
Tampa, Florida (USA)
Research Article|
May 09 2003
Orbital order and anisotropic transport properties in doped manganites induced by epitaxial coherency strain
J. Klein;
J. Klein
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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J. B. Philipp;
J. B. Philipp
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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D. Reisinger;
D. Reisinger
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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M. Opel;
M. Opel
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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A. Marx;
A. Marx
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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A. Erb;
A. Erb
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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L. Alff;
L. Alff
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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R. Gross
R. Gross
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Strasse 8, 85748 Garching, Germany
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J. Appl. Phys. 93, 7373–7375 (2003)
Citation
J. Klein, J. B. Philipp, D. Reisinger, M. Opel, A. Marx, A. Erb, L. Alff, R. Gross; Orbital order and anisotropic transport properties in doped manganites induced by epitaxial coherency strain. J. Appl. Phys. 15 May 2003; 93 (10): 7373–7375. https://doi.org/10.1063/1.1555366
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