Hartree-Fock studies of surface properties of BaTiO3

L. Fu, E. Yaschenko, L. Resca, and R. Resta
Phys. Rev. B 60, 2697 – Published 15 July 1999
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Abstract

We study several surface properties of BaTiO3: namely, the surface charge, surface energy, and surface dynamical charges, within an ab initio Hartree-Fock scheme. We use both genuinely isolated slabs and periodically repeated slabs, with different terminations. We report these properties as functions of the thickness and termination of the slabs. The ability to deal with genuinely isolated slabs is a virtue of the localized-basis implementation that we adopt. In particular, the slab surface charge provides a value for the spontaneous polarization in excellent agreement with the calculation of the latter as a Berry phase, and with experiment as well. On the other hand, we find that when periodically repeated slabs are used, the interactions among slabs and the fictitious field imposed by the periodic boundary conditions can significantly affect the accuracy of the calculations, even at quite large vacuum separations.

  • Received 9 September 1998

DOI:https://doi.org/10.1103/PhysRevB.60.2697

©1999 American Physical Society

Authors & Affiliations

L. Fu, E. Yaschenko, and L. Resca

  • Department of Physics, The Catholic University of America, Washington, D.C. 20064

R. Resta

  • Department of Physics, The Catholic University of America, Washington, D.C. 20064;
  • Istituto Nazionale di Fisica della Materia (INFM), Strada Costiera 11, I-34014 Trieste, Italy; and
  • Dipartimento di Fisica Teorica, Università di Trieste, I-34014 Trieste, Italy

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Vol. 60, Iss. 4 — 15 July 1999

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