Anisotropic strains and magnetoresistance of La_{0.7}Ca_{0.3}MnO_{3}

Abstract

Thin films of perovskite manganite La_{0.7}Ca_{0.3}MnO_{3} were grown epitaxially on SrTiO_3(100), MgO(100) and LaAlO_3(100) substrates by the pulsed laser deposition method. Microscopic structures of these thin film samples as well as a bulk sample were fully determined by x-ray diffraction measurements. The unit cells of the three films have different shapes, i.e., contracted tetragonal, cubic, and elongated tetragonal for SrTiO_3, MgO, and LaAlO_3 cases, respectively, while the unit cell of the bulk is cubic. It is found that the samples with cubic unit cell show smaller peak magnetoresistance than the noncubic ones do. The present result demonstrates that the magnetoresistance of La_{0.7}Ca_{0.3}MnO_{3} can be controlled by lattice distortion via externally imposed strains.

Revtex, 10 pages, 2 figures

References in corpus (2)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Double Degeneracy and Jahn-Teller Effects in CMR Perovskites

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• Modelling of strain effects in manganite films
• Effect of Strain Relaxation on Magnetotransport properties of epitaxial La_0.7Ca_0.3MnO_3 films
• Substrate-induced strain effects on Pr_{0.6}Ca_{0.4}MnO_{3} films
• Interrelation of epitaxial strain and oxygen deficiency in La0.7Ca0.3MnO3-δ thin films
• Cooperative Jahn-Teller transition and resonant x-ray scattering in thin film $\mathrm{LaMn}{\mathrm{O}}_3$
• Selective epitaxial growth of sub-micron complex oxide structures by amorphous SrTiO3
• Anisotropic strains, metal-insulator transition, and magnetoresistance of La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ films