Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 29, Issue 36, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aa7b5d
Keywords
dielectric resonance; barium titanate; yttrium iron garnet; negative permittivity; Kramers-Kronig relation
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Funding
- National Natural Science Foundation of China [51402170, 51601105]
- Natural Science Foundation of Shandong Province [ZR2016EMM09]
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Recently, negative parameters such as negative permittivity and negative permeability have been attracting extensive attention for their unique electromagnetic properties. Usually, negative permittivity is well achieved by plasma oscillation of free electrons in conductor-insulator composites or metamaterials, while some attention has been paid to attaining negative permittivity in ceramics to reduce dielectric loss. In this paper, negative permittivity in barium titanate and yttrium iron garnet composites are reported which was well fitted by the Lorentz model. Further, negative permittivity behavior was verified via Kramers-Kronig relations, and it revealed that the causal principle still valid for negative permittivity resulted from dielectric resonance. The interrelationships among negative permittivity, capacitive inductive transition and ac conductivity are discussed.
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