TY - UNPB
T1 - Is ferroelectric polarization spontaneous? The hidden effect of oxygen vacancies
AU - Hershkovitz, Asaf
AU - Hemaprabha, Elangovan
AU - Khorshid, Doaa
AU - Ma, Liyang
AU - Liu, Shi
AU - Ivry, Yachin
N1 - https://doi.org/10.48550/arXiv.2202.13442
PY - 2022
Y1 - 2022
N2 - The abrupt transition from a disordered phase to collective ion behavior in ferroelectrics serves as a model system to study spontaneous symmetry breaking in nature. First-principle calculations combined with atomic-scale imaging demonstrate that oxygen vacancies that serve as pinning sites for the ferroic domain walls remain immobile above the Curie temperature in the seminal ferroelectric barium titanate. Thus, upon cooling, these oxygen vacancies dictate reproducible domain-wall patterning. Domain-scale imaging with variable-temperature piezoresponse force microscopy confirmed the polarization memory effect, questioning the spontaneity of the ferroelectric transition.
AB - The abrupt transition from a disordered phase to collective ion behavior in ferroelectrics serves as a model system to study spontaneous symmetry breaking in nature. First-principle calculations combined with atomic-scale imaging demonstrate that oxygen vacancies that serve as pinning sites for the ferroic domain walls remain immobile above the Curie temperature in the seminal ferroelectric barium titanate. Thus, upon cooling, these oxygen vacancies dictate reproducible domain-wall patterning. Domain-scale imaging with variable-temperature piezoresponse force microscopy confirmed the polarization memory effect, questioning the spontaneity of the ferroelectric transition.
U2 - https://doi.org/10.48550/arXiv.2202.13442
DO - https://doi.org/10.48550/arXiv.2202.13442
M3 - Preprint
BT - Is ferroelectric polarization spontaneous? The hidden effect of oxygen vacancies
ER -