Ferroelectricity and tetragonality in ultrathin PbTiO3 films

Abstract

The evolution of tetragonality with thickness has been probed in epitaxial c-axis oriented PbTiO3 films with thicknesses ranging from 500 down to 24 Angstroms. High resolution x-ray pointed out a systematic decrease of the c-axis lattice parameter with decreasing film thickness below 200 Angstroms. Using a first-principles model Hamiltonian approach, the decrease in tetragonality is related to a reduction of the polarization attributed to the presence of a residual unscreened depolarizing field. It is shown that films below 50 Angstroms display a significantly reduced polarization but still remain ferroelectric.

4 pages, Tex, 3 figures Update: A few changes were made. These are mainly more explicit references to the literature regarding the Ginzburg-Landau-Devonshire theory

References in corpus (4)

• Ab initio study of BaTiO3 and PbTiO3 surfaces in external electric fields
• Ab initio statistical mechanics of the ferroelectric phase transition in PbTiO3
• A Microscopic Model of Ferroelectricity in Stress-free PbTiO3 Ultrathin Films
• Ultrathin epitaxial ferroelectric films grown on compressive substrates: Competition between the surface and strain effects

Cited by in corpus (44)

• Physics of thin-film ferroelectric oxides
• Tunneling electroresistance effect in ferroelectric tunnel junctions at the nanoscale
• Ferroelectricity in ultra-thin perovskite films
• Unusual behaviour of the ferroelectric polarization in PbTiO${}_3$/SrTiO${}_3$ superlattices
• Interface-Controlled Ferroelectricity at the Nanoscale
• Atomic-scale compensation phenomena at polar interfaces
• Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics
• Colloquium: Physical properties of group-IV monochalcogenide monolayers
• Tunneling Electroresistance in Ferroelectric Tunnel Junctions with a Composite Barrier
• Tuning of the depolarization field and nanodomain structure in ferroelectric thin films
• Equilibrium and Stability of Polarization in Ultrathin Ferroelectric Films with Ionic Surface Compensation
• Overcoming the Fundamental Barrier Thickness Limits of Ferroelectric Tunnel Junctions through BaTiO3/SrTiO3 Composite Barriers
• Combining half-metals and multiferroics into epitaxial heterostructures for spintronics
• Extrinsic and Intrinsic Charge Trapping at the Graphene/Ferroelectric Interface
• Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films
• Depolarizing-Field Effect in Strained Nanoscale Ferroelectric Capacitors and Tunnel Junctions
• Phenomenological theory of phase transitions in epitaxial BaTiO3 thin films
• 180 degree Ferroelectric Stripe Nanodomains in BiFeO3 Thin Films
• Thickness-dependent polarization of strained BiFeO3 films with constant tetragonality
• A switchable diode based on room-temperature two-dimensional ferroelectric α-In2Se3 thin layers
• Ferroelectric Dead Layer Driven by a Polar Interface
• The Piezoresponse Force Microscopy of surface layers and thin films: effective response and resolution function
• Ferroelectric thin films phase diagrams with self-polarized phase and electret state
• Monodomain to polydomain transition in ferroelectric PbTiO3 thin films with La0.67Sr0.3MnO3 electrodes
• Magnetic tunnel junctions based on ferroelectric Hf0.5Zr0.5O2 tunnel barriers
• Full field electron spectromicroscopy applied to ferroelectric materials
• Surface reconstruction and ferroelectricity in PbTiO${}_3$ thin films
• Extrinsic Size Effect in Piezoresponse Force Microscopy of Thin Films
• In-situ x-ray diffraction and the evolution of polarization during the growth of ferroelectric superlattices
• Role of ferroelectric polarization during growth of highly strained ferroelectrics revealed by in-situ x-ray diffraction
• Phase-field modeling of chemical control of polarization stability and switching dynamics in ferroelectric thin film
• Modelling Thickness-Dependence of Ferroelectric Thin Film Properties
• Phase Diagrams and Domain Splitting in Thin Ferroelectric Films with Incommensurate Phases
• The screening effects influence on the nano-domain tailoring in ferroelectrics-semiconductors
• Domain Wall Orientations in Ferroelectric Superlattices Probed with Synchrotron X-Ray Diffraction
• Polarization dependent chemistry of ferroelectric BaTiO3 (001) domains
• On the persistence of polar domains in ultrathin ferroelectric capacitors
• Polar morphologies from first principles: PbTiO${}_3$ films on SrTiO${}_3$ substrates and the $p(2\times \Lambda )$ surface reconstruction
• Non-monotonic thickness dependence of Curie temperature and ferroelectricity in Two-dimensional SnTe film
• Electron transport through asymmetric ferroelectric tunnel junctions: current-voltage characteristics
• Kinetics of nano-size Ferroelectrics
• Combined electrostatic and strain engineering of BiFeO${}_3$ thin films at the morphotropic phase boundary
• Influence of image forces on the electron transport in ferroelectric tunnel junctions
• Improper Ferroelectricity at the Monolayer Limit