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Title: Tuning the electrical properties of La[sub 0.75]Ca[sub 0.25]MnO₃ thin films by ferroelectric polarization, ferroelectric-field effect, and converse piezoelectric effect
Authors: Zheng, RK
Wang, Y 
Wang, J
Wong, KS
Chan, HLW 
Choy, CL 
Luo, H
Issue Date: 26-Sep-2006
Source: Physical review. B, Condensed matter and materials physics, 26 Sept. 2006, v. 74, 094427, p. 1-8
Abstract: Thin films of La[sub 0.75]Ca[sub 0.25]MnO₃ (LCMO) have been grown on ferroelectric (1−x)Pb(Mg[sub ⅓]Nb[sub ⅔])O₃-xPbTiO₃(x~0.33) single-crystal substrates. The ferroelectric polarization in the PMN-PT substrates gives rise to a decrease in resistance and an upward shift in Curie temperature of the LCMO films, which was interpreted in terms of the ferroelectric polarization induced lattice strain effect. The resistance of the LCMO films can be modulated by applying dc/ac electric fields across the polarized PMN-PT substrates. The electric field induces lattice strains in the PMN-PT substrates via the converse piezoelectric effect, which subsequently changes the strain state and resistance of the LCMO films. A quantitative relation between the resistance in the LCMO films and the induced lattice strains in the PMN-PT substrates has been established. Moreover, we identified that the ferroelectric polarization and converse piezoelectric effect induced lattice strain effects dominate over the field effect in the LCMO/PMN-PT systems.
Keywords: Lanthanum compounds
Calcium compounds
Magnetic thin films
Colossal magnetoresistance
Lead compounds
Dielectric polarisation
Ferroelectric Curie temperature
Internal stresses
Piezoelectricity
Publisher: American Physical Society
Journal: Physical review. B, Condensed matter and materials physics 
ISSN: 1098-0121
EISSN: 1550-235X
DOI: 10.1103/PhysRevB.74.094427
Rights: Physical Review B © 2006 American Physical Society. The Journal's web site is located at http://prb.aps.org/
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