Coexistence of Soft Modes and Dynamic Ti Disorder in Cubic BaTiO3 Studied by Inelastic Neutron Scattering

Tomeno, Izumi; Fernandez-Baca, Jaime A.; Chi, Songxue; Oka, Kunihiko; Tsunoda, Yorihiko

doi:10.7566/jpsj.89.054601

Title: Coexistence of Soft Modes and Dynamic Ti Disorder in Cubic BaTiO₃ Studied by Inelastic Neutron Scattering

Journal Article · Fri Apr 03 00:00:00 EDT 2020 · Journal of the Physical Society of Japan

DOI:https://doi.org/10.7566/jpsj.89.054601· OSTI ID:1684666

Tomeno, Izumi ^[1];

^[2];

^[2]; Oka, Kunihiko ^[3]; Tsunoda, Yorihiko ^[4]

Akita Univ., Akita (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Inst. of Advanced Industrial Science and Technology, Tsukuba, Ibaraki (Japan). Nanoelectronics Research Inst.
Waseda Univ., Shinjuku, Tokyo (Japan)

The phonon dispersion relations in cubic BaTiO₃ have been measured along the [100], [110], and [111] directions at T = 453 K using inelastic neutron scattering. The isotropic transverse acoustic (TA) branches indicate that the interatomic force constant between Ba and O atoms in BaTiO₃ is large compared with that between Pb and O atoms in PbTiO₃. The transverse optical (TO) branches along the [100] and [111] directions soften toward the Brillouin zone center. The TO branch along the [110] direction with [001] polarization is relatively low and flat, indicating the weak interatomic force constant between Ti and O atoms along the Ti–O chain. The intensity of inelastic diffuse scattering along the [100] and [110] directions increases with decreasing temperature down to 453 K. In conclusion, the present results suggest that the soft modes coexist with the dynamic Ti disorder in the Ti–O chain near the phase transition in the cubic phase.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1684666

Journal Information:: Journal of the Physical Society of Japan, Vol. 89, Issue 5; ISSN 0031-9015

Publisher:: Physical Society of JapanCopyright Statement

Country of Publication:: United States

Language:: English

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