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Published on: August 15, 2015
First-principles study of the temperature-pressure phase diagram of BaTiO3
Jorge Iñiguez1, David Vanderbilt
1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA.
Abstract:
We investigate the temperature-pressure phase diagram of BaTiO3 using a first-principles effective-Hamiltonian approach. We find that the zero-point motion of the ions affects the form of the phase diagram dramatically. Specifically, when the zero-point fluctuations are included in the calculations, all the polar (tetragonal, orthorhombic, and rhombohedral) phases of BaTiO3 survive down to 0 K, while only the rhombohedral phase does otherwise. This behavior results from a practical equivalence between thermal and quantum fluctuations. Our work confirms the essential correctness of the phase diagram proposed by Ishidate et al. [Phys. Rev. Lett. 78, 2397 (1997)]].
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