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• W1977172092 abstract "Using ferroelectric $0.67text{Pb}({text{Mg}}_{1/3}{text{Nb}}_{2/3}){text{O}}_{3}text{ensuremath{-}}0.33{text{PbTiO}}_{3}$ single crystals as substrates, we studied the effects of the ferroelectric poling and the converse piezoelectric effect on the strain state, resistance, insulator-to-metal transition temperature $({T}_{C})$, and magnetoresistance (MR) of ${text{La}}_{0.7}{text{Ba}}_{0.3}{text{MnO}}_{3}$ (LBMO) thin films. In situ x-ray diffraction measurements indicate that the ferroelectric poling (or the converse piezoelectric effect) induces a substantial reduction in the in-plane tensile strain in the LBMO film, giving rise to a decrease in the resistance and an increase in ${T}_{C}$. The relative changes of the resistance and ${T}_{C}$ are proportional to the induced reduction in the in-plane tensile strain $(ensuremath{delta}{ensuremath{epsilon}}_{xx})$ in the film. The reduction in the in-plane tensile strain leads to opposite effects on MR below and above ${T}_{C}$, namely, MR is reduced for $T<{T}_{C}$ while MR is enhanced for $T>{T}_{C}$. We discuss these strain effects within the framework of the Jahn-Teller (JT) electron-lattice coupling and phase separation scenario that are relevant to the induced strain. Similar studies on ${text{CaMnO}}_{3}$ thin films, for which there is no JT distortion of ${text{MnO}}_{6}$ octahedra, show that the resistance of the films also decreases when the tensile strain is reduced, indicating that the resistance change arising from the reduction in Mn-O bond length dominates over that arising from the reduction in Mn-O-Mn bond angle." @default.
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• W1977172092 date "2009-05-14" @default.
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• W1977172092 title "Ferroelectric poling and converse-piezoelectric-effect-induced strain effects in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>La</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ba</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>MnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>thin films …" @default.
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• W1977172092 doi "https://doi.org/10.1103/physrevb.79.174420" @default.
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