Temperature-dependent dielectric and piezoelectric response of ferroelectrics from first principles

Details Temperature-dependent dielectric and piezoelectric response of ferroelectrics from first principles Temperature-dependent dielectric and piezoelectric response of ferroelectrics from first principles

1998-04-06

arxiv.org/abs/cond-mat/9804056v1

Physics

Condensed Matter

Materials Science

10 pages, LaTeX (aipproc), three eps figures

Scientific paper

10.1063/1.56281

A method for the calculation of the temperature dependence of dielectric and piezoelectric responses, based on the use of a first-principles effective Hamiltonian, is described. Results are presented for the ferroelectric perovskite PbTiO3. While the method includes only the soft-mode contributions to the responses, it is argued to give a good description of the divergences or near-divergences of the response functions near the cubic-tetragonal transition. The expression of the response functions in terms of correlation functions is used to provide a real-space interpretation of the responses which clearly distinguishes between PbTiO3 and the related materials BaTiO3 and KNbO3.

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