Effect of external stress on ferroelectricity in epitaxial thin films

Emelyanov, A. Yu.; Pertsev, N. A.; Kholkin, A. L.

doi:10.1103/physrevb.66.214108

Cited by 86 publications

(69 citation statements)

References 21 publications

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“…A proven effective approach is via a thermodynamic formulation based on a GinzburgLandau-type free energy functional. 34,35,37,43,46,47 Taking into account effects of the surface tension, interface, surface, depolarization field and uniform external applied stress z , the total free energy for the FNC can be written as, 34,46,56 …”

Section: ͑4͒mentioning

confidence: 99%

“…Absent an external electric field, the internal electric field in the FNC can be derived via the Maxwell's equations, 1,8,27,32,47 and is related to the depolarization field by E d ͑z͒ =−͓P͑z͒ + q e ͔ / b for −H / 2 Յ z Յ H / 2, here b is the background dielectric constant of ferroelectrics. [44][45][46][47][48]51,56 In the following, we assume that the top and bottom electrodes are the same, i.e., eT = eB = e and l sT = l sB = l s , re-…”

Section: The Physical Modelmentioning

confidence: 99%

“…The first component can be formulated in terms of the screening length l s in the electrodes, 32,[51][52][53][54][55][56] where l s 2 Ϸ͑3 / 8 ͒ 2 ͑h 2 e / 3q 2 m ‫ء‬ n 0 1/3 ͒, h, the Planck constant, e , the dielectric constant of the electrode, m ‫ء‬ , the electron effective mass in electrode and n 0 , the mean electron density at zero electric field. The second component is more complex and is determined by several factors, including space and surface charges, the small size effect, interface effect or Schottky barriers etc.…”

Section: The Physical Modelmentioning

confidence: 99%

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Hyper-sensitive piezophotovoltaic effects in ferroelectric nanocylinders

Zheng

Woo

2010

Journal of Applied Physics

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Photocurrent system of the ferroelectric nanocylinder ͑FNC͒, including nanodisks, nanorods, and nanowires, sandwiched between metal electrodes with the short-circuit boundary conditions has been designed and investigated. Taking into account the polarization charge screening in the electrodes and near-surface inhomogeneous polarization distribution, a theoretical model for investigating the photoinduced current of the FNC under the illumination of light was established. Our results show that the photocurrent of the FNC can be totally controlled by adjusting its size and states of the polarization "up" and "down." Especially, reversing an applied stress can obviously change the photocurrent of the FNC, which is particularly significant near the stress-dependent para/ferroelectric phase transition. This piezophotovoltaic effect may have good potential for applications in high-sensitivity photomechanical sensors, memories, switchable nanodevices, or other photovoltaic nanodevices.

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Section: ͑4͒mentioning

confidence: 99%

Section: The Physical Modelmentioning

confidence: 99%

Section: The Physical Modelmentioning

confidence: 99%

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Hyper-sensitive piezophotovoltaic effects in ferroelectric nanocylinders

Zheng

Woo

2010

Journal of Applied Physics

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“…This approach greatly decreases the computational effort involved in computing the phase diagram and readily allows the inclusion of nonzero external stress. 9 Moreover, the parameters can be fully specified in a compact table, and the functional form of the energy is suitable for analytical computations and conceptual interpretation, leading to a classification of possible stress-strain phase diagrams. These results can be used for predictions of the structure of epitaxially strained thin films grown on substrates with square symmetry, and for the design of novel perovskite strained-layer superlattices with two or more components.…”

Section: Introductionmentioning

confidence: 99%

First-principles study of epitaxial strain in perovskites

2005

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Using an extension of a first-principles method developed by King-Smith and Vanderbilt [Phys. Rev. B 49, 5828 (1994)], we investigate the effects of in-plane epitaxial strain on the groundstate structure and polarization of eight perovskite oxides: BaTiO3, SrTiO3, CaTiO3, KNbO3, NaNbO3, PbTiO3, PbZrO3, and BaZrO3. In addition, we investigate the effects of a nonzero normal stress. The results are shown to be useful in predicting the structure and polarization of perovskite oxide thin films and superlattices.

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“…In the literature, there are some works studying three-dimensional polarization phase diagrams of ferroelectric thin films without considering the depolarization field. 14,18,19 Recently, Glinchuk et al 20 comprehensively studied three-dimensional polarization phase diagrams of ferroelectric thin films with the consideration of depolarization field. In addition, they introduced an additional surface polarization, which was induced by surface piezoelectricity.…”

Section: Introductionmentioning

confidence: 99%

Influence of depolarization field on polarization states in epitaxial ferroelectric thin films with nonequally biaxial misfit strains

Wang

Zhang

2008

Phys. Rev. B

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Depolarization field and misfit strain are two important factors that greatly influence the properties of ferroelectric thin films. The present work studies the effect of depolarization field on polarization states in a single-domain ferroelectric thin film with nonequally biaxial in-plane misfit strains. Three coupled EulerLagrange equations are derived from the minimization of the total free energy and solved numerically. Misfitstrain-misfit-strain phase diagrams are constructed to represent the polarization states. Under the short-circuit boundary condition, the depolarization field shifts the phase boundaries in the phase diagrams, leading to the contraction and expansion of the regions of out-of-plane and in-plane phases, respectively. Under the opencircuit boundary condition, there exists an out-of-plane electretlike state under high compressive misfit strains when a surface polarization P m is included.

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Effect of external stress on ferroelectricity in epitaxial thin films

Cited by 86 publications

References 21 publications

Hyper-sensitive piezophotovoltaic effects in ferroelectric nanocylinders

Hyper-sensitive piezophotovoltaic effects in ferroelectric nanocylinders

First-principles study of epitaxial strain in perovskites

Influence of depolarization field on polarization states in epitaxial ferroelectric thin films with nonequally biaxial misfit strains

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