期刊
APPLIED PHYSICS LETTERS
卷 93, 期 19, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3025465
关键词
barium compounds; dielectric polarisation; dielectric relaxation; ferroelectric Curie temperature; permittivity; photon correlation spectroscopy
Long range correlation dynamics of polarization clusters in BaTiO3 have been observed directly near the Curie temperature (T-C) by photon correlation spectroscopy. A correlation length on the order of 200 nm was found to be dynamic near T-C with a characteristic relaxation time of several microseconds. This relaxation time decreased with an increase in temperature, but exhibited an anomaly at T-C, indicating the dominating contribution to the dielectric permittivity by these polarization clusters near T-C.
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