Broadband dielectric spectroscopy on single-crystalline and ceramic CaCu3Ti4O12

Abstract

We present dielectric measurements of the colossal dielectric constant material CaCu3Ti4O12 extending up to 1.3 GHz also covering so far only rarely investigated single crystalline samples. Special emphasis is put on the second relaxation reported in several works on polycrystals, which we detect also in single crystals. For polycrystalline samples we provide a recipe to achieve values of the dielectric constant as high as in single crystals.

arXiv comment3 pages, 3 figures

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• Absence of polar order in LuFe2O4
• Broadband dielectric response of CaCu3Ti4O12: From dc to the electronic transition regime
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• Frequency dependent polarisation switching in h-ErMnO${}_3$
• Colossal magnetocapacitive effect in differently synthesized and doped CdCr2S4
• AC and DC conductivity correlation: The coefficient of Barton--Nakajima--Namikawa relation
• Insulating improper ferroelectric domain walls as robust barrier layer capacitors