Charge transfer in the high dielectric constant materials CaCu3Ti4O12 and CdCu3Ti4O12

Details Charge transfer in the high dielectric constant materials CaCu3Ti4O12 and CdCu3Ti4O12 Charge transfer in the high dielectric constant materials CaCu3Ti4O12 and CdCu3Ti4O12

2002-09-16

arxiv.org/abs/cond-mat/0209367v1

Phys. Rev. B 67, 092106 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 4 embedded EPS figures

Scientific paper

10.1103/PhysRevB.67.092106

The cubic perovskite-related ceramic CaCu3Ti4O12 has a very high static dielectric constant ~10000 at room temperature (RT), which drops to about 100 below about 100 K. Substituting Cd for Ca reduces the RT value of the dielectric constant by over an order of magnitude. The large the dielectric constant may be due to an internal barrier layer capacitance (IBLC) effect. Infrared optical properties show a low-frequency mode that increases dramatically in strength at low temperature, suggesting a change in the effective charges and a breakdown of the IBLC model due to a semiconductor-to-insulator transition.

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