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In-Plane Grain Boundary Effects on the Transport Properties of La0.7Sr0.3MnO3-δ Thin Films

Published online by Cambridge University Press:  10 February 2011

J. Y. Gu ,
S. B. Ogale ,
K. Ghosh ,
T. Venkatesan ,
R. Ramesh ,
V. Radmilovic ,
U. Dahmen ,
G. Thomas  and
T. W. Noh
J. Y. Gu
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, jygu@squid.umd.edu Department of Physics, Seoul National University, Seoul 151–742, Korea
S. B. Ogale
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, jygu@squid.umd.edu
K. Ghosh
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, jygu@squid.umd.edu
T. Venkatesan
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, jygu@squid.umd.edu
R. Ramesh
Affiliation:
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, jygu@squid.umd.edu
V. Radmilovic
Affiliation:
National Center for Electron Microscopy, Berkeley, CA 94720
U. Dahmen
Affiliation:
National Center for Electron Microscopy, Berkeley, CA 94720
G. Thomas
Affiliation:
National Center for Electron Microscopy, Berkeley, CA 94720
T. W. Noh
Affiliation:
Department of Physics, Seoul National University, Seoul 151–742, Korea
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Abstract

C-axis oriented La0.7Sr0.3MnO3.δ (LSMO) films were fabricated on the top of SrTiO3/YBa2Cu3O7 grown on MgO(001) substrates. From x-ray φ-scan and planar transmission electron microscopy measurements, the LSMO layer in the LSMO/SrTiO3/YBa2Cu3O7/MgO heterostructure is found to have coherent in-plane grain boundaries with a predominance of 45° rotations (between [100] and [110] grains) in addition to the cube-on-cube epitaxial relationship. Also, epitaxial LSMO/Bi4Ti3O12/LaAl03 (001) and c-axis textured LSMO/Bi4Ti3O12/SiO2/Si(001) with random in-plane grain boundaries are introduced as the counterparts for comparison. The resistivity and magnetoresistance (MR) of LSMO layer were measured and compared in these three different heterostructures. The low field MR at low temperature shows a dramatic dependence on the nature of the grain boundary. An attempt is made to interpret these results on the basis of correlation between the magnetic properties and grain structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 257
Copyright
Copyright © Materials Research Society 1998

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References

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