Smearing of phase transition due to a surface effect or a bulk inhomogeneity in ferroelectric nanostructures

The boundary conditions, customarily used in the Landau-type approach to ferroelectric thin films and nanostructures, have to be modified to take into account that a surface of a ferroelectric is a defect of a field type. The surface (interface) field is coupled to a normal component of polarization...

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Bibliographic Details
Published in:Physical review letters 2005-03, Vol.94 (10), p.107601-107601, Article 107601
Main Authors: BRATKOVSKY, A. M, LEVANYUK, A. P
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Specific phase transitions
Structural transitions in nanoscale materials
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Summary:The boundary conditions, customarily used in the Landau-type approach to ferroelectric thin films and nanostructures, have to be modified to take into account that a surface of a ferroelectric is a defect of a field type. The surface (interface) field is coupled to a normal component of polarization and, as a result, the second order phase transitions are generally suppressed and anomalies in response are washed out, as observed experimentally.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.94.107601