Strain-Induced Ferroelectric SrTiO3 Thin Films Grown Coherently on Si(001): Experiment and Theory
Joseph Woicik, Eric L. Shirley, Daniel A. Fischer, S Sambasivan, C R. Ashman, C S. Hellberg, H Li
Ferroelectric crystals possess an electric dipole moment even in the absence of an external electric field. In order for this spontaneous polarization to arise, the center of positive charge of the crystal must displace from its center of negative charge. Concomitant to this loss of inversion symmetry is the macroscopic distortion of the unit cell. For example, the ferroelectric perovskite BaTiO3 exhibits a rich ferroelectric and structural phase diagram, transforming from paraelectric cubic to ferroelectric tetragonal and ultimately to ferroelectric orthorhombic as the temperature is lowered below its Curie point Tc. The intrinsic relationship between polarization, and strain in complex oxides may therefore be used to tailor both their electronic and structural properties through the substrate clamping effect that results as a consequence of thin-film hetero-epitaxial growth.
Proceedings| 2006| Fundamental Physics of Ferroelectrics Conference
, Shirley, E.
, Fischer, D.
, Sambasivan, S.
, Ashman, C.
, Hellberg, C.
and Li, H.
Strain-Induced Ferroelectric SrTiO<sub>3</sub> Thin Films Grown Coherently on Si(001): Experiment and Theory, Proceedings| 2006| Fundamental Physics of Ferroelectrics Conference, Undefined
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