Open AccessAnisotropic strains and magnetoresistance of La0.7Ca0.3MnO3
Author(s) -
T. Y. Koo,
S. H. Park,
K.-B. Lee,
Yoon Hee Jeong
Publication year - 1997
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.119705
Subject(s) - manganite , magnetoresistance , tetragonal crystal system , condensed matter physics , pulsed laser deposition , materials science , colossal magnetoresistance , thin film , perovskite (structure) , epitaxy , giant magnetoresistance , anisotropy , diffraction , crystallography , ferromagnetism , crystal structure , nanotechnology , chemistry , optics , physics , magnetic field , layer (electronics) , quantum mechanics
Thin films of perovskite manganite La_{0.7}Ca_{0.3}MnO_{3} were grownepitaxially on SrTiO_3(100), MgO(100) and LaAlO_3(100) substrates by the pulsedlaser deposition method. Microscopic structures of these thin film samples aswell as a bulk sample were fully determined by x-ray diffraction measurements.The unit cells of the three films have different shapes, i.e., contractedtetragonal, cubic, and elongated tetragonal for SrTiO_3, MgO, and LaAlO_3cases, respectively, while the unit cell of the bulk is cubic. It is found thatthe samples with cubic unit cell show smaller peak magnetoresistance than thenoncubic ones do. The present result demonstrates that the magnetoresistance ofLa_{0.7}Ca_{0.3}MnO_{3} can be controlled by lattice distortion via externallyimposed strains.Comment: Revtex, 10 pages, 2 figure
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