Journal
APPLIED PHYSICS LETTERS
Volume 76, Issue 19, Pages 2767-2769Publisher
AMER INST PHYSICS
DOI: 10.1063/1.126469
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The ground-state polarization of PbTiO3 thin films is studied using a microscopic effective Hamiltonian with parameters obtained from first-principles calculations. Under short-circuit electrical boundary conditions, (001) films with thickness as low as three unit cells are found to have a perpendicularly polarized ferroelectric ground state with significant enhancement of the polarization at the surface. (C) 2000 American Institute of Physics. [S0003- 6951(00)02119-7].
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