Reference : Ferroelectricity and tetragonality in ultrathin PbTiO3 films
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/30985
Ferroelectricity and tetragonality in ultrathin PbTiO3 films
English
Lichtensteiger, C. [> > > >]
Triscone, J. M. [> > > >]
Junquera, J. [> > > >]
Ghosez, Philippe mailto [Université de Liège - ULg > Département de physique > Physique théorique des matériaux >]
2005
Physical Review Letters
American Physical Society
94
047603
Yes (verified by ORBi)
International
0031-9007
1079-7114
Ridge
NY
[en] The evolution of tetragonality with thickness has been probed in epitaxial c-axis oriented PbTiO3 films with thicknesses ranging from 500 down to 24 Angstrom. High resolution x ray pointed out a systematic decrease of the c-axis lattice parameter with decreasing film thickness below 200 Angstrom. 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 Angstrom display a significantly reduced polarization but still remain ferroelectric.
Researchers ; Professionals
http://hdl.handle.net/2268/30985
10.1103/PhysRevLett.94.047603

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