Colossal dielectric constants in transition-metal oxides

Details Colossal dielectric constants in transition-metal oxides Colossal dielectric constants in transition-metal oxides

2010-03-22

arxiv.org/abs/1003.4272v1

Eur. Phys. J. Special Topics 180, 61 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

31 pages, 18 figures, submitted to Eur. Phys. J. for publication in the Special Topics volume "Cooperative Phenomena in Solids

Scientific paper

10.1140/epjst/e2010-01212-5

Many transition-metal oxides show very large ("colossal") magnitudes of the dielectric constant and thus have immense potential for applications in modern microelectronics and for the development of new capacitance-based energy-storage devices. In the present work, we thoroughly discuss the mechanisms that can lead to colossal values of the dielectric constant, especially emphasising effects generated by external and internal interfaces, including electronic phase separation. In addition, we provide a detailed overview and discussion of the dielectric properties of CaCu3Ti4O12 and related systems, which is today's most investigated material with colossal dielectric constant. Also a variety of further transition-metal oxides with large dielectric constants are treated in detail, among them the system La2-xSrxNiO4 where electronic phase separation may play a role in the generation of a colossal dielectric constant.

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