A low-temperature specific heat study of giant dielectric constant materials

C. P. Sun, Jianjun Liu, Jiunn-Yuan Lin, Chun Gang Duan, W. N. Mei, H. D. Yang

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Abstract

A low-temperature specific heat study has been performed on the insulating giant dielectric constant material CaCu3Ti4O12 and two related compounds, Bi2/3Cu3Ti4O 12 and La0.5Na0.5Cu3Ti 4O12, from 0.6 to 10 K. From analyzing the specific heat data in a very low-temperature range, 0.6-1.5 K, and moderately low-temperature range, 1.5-5 K, in addition to the expected Debye terms, we observed significant contributions originating from the linear and Einstein terms, which we attributed as the manifestation of low-lying elementary excitations due to lattice vibrations occurring at the grain boundaries and induced by local defects. Together with the findings on electronic and mechanical properties, a phenomenological model is proposed to explain the high dielectric constant behavior in both low and high frequency regions.

Original languageAmerican English
Article number285214
JournalJournal of Physics Condensed Matter
Volume20
Issue number28
DOIs
StatePublished - 16 Jul 2008

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