Negative magnetodielectric effect in CaCu₃Ti₄O₁₂
Date
2013-12-19
Authors
Chen, Kai
Huang, Chenxi
Zhang, Xirui
Yu, Yuanlie
Lau, Kenny
Hu, Wanbiao
Li, Qian
Wang, Jian
Lin, Weiwei
Liu, Junming
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American Institute of Physics
Abstract
Real part of complex relative dielectric value is relatively decreased as large as ∼5 % from 50 K to 200 K in CaCu₃Ti₄O₁₂, by applying a 6-T static magnetic field. CaCu₃Ti₄O₁₂ is thus implied primarily by the negative magnetodielectric effect, as a unified dielectric system in which 1-D finite dipole chains of B-site titanium ions, coexist with a collective of polaron-like 3d-electrons of A-site copper ions: the dipole chains are thermally activated for lattice ionic polarization above 50 K, and suppressed by the short-range hop of these quasi-particles, while their long-range movement are for bulk electronic polarization above 151 K.
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Journal of Applied Physics
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