Lattice and electronic band structure changes across the surface ferroelectric transition

Authors
Choi, J Dowben, PA Ducharme, S Fridkin, VM Palto, SP Petukhova, N Yudin, SG
Citation
J. Choi et al., Lattice and electronic band structure changes across the surface ferroelectric transition, PHYS LETT A, 249(5-6), 1998, pp. 505-511
Citations number
25
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS A
ISSN journal
03759601 → ACNP
Volume
249
Issue
5-6
Year of publication
1998
Pages
505 - 511
Database
ISI
SICI code
0375-9601(199812)249:5-6<505:LAEBSC>2.0.ZU;2-C
Abstract
The origin of the surface ferroelectric phase transition in crystalline cop olymer films of vinylidene fluoride (70%) with trifluoroethylene (30%) is e xplored. We report a uniaxial doubling of the surface Brillouin zone in the conduction band dispersion across the surface ferroelectric phase transiti on. The temperature dependent changes in the electronic structure occur pri marily in the conduction band and are accompanied by a surface dipole reori entation. (C) 1998 Elsevier Science B.V.