Localized polarons and conductive charge carriers: understanding CaCu${}_3$Ti${}_4$O${}_{12}$ over a broad temperature range

Abstract

CaCu${}_3$Ti${}_4$O${}_{12}$ (CCTO) has a large dielectric permittivity that is independent of the probing frequency near the room temperature, which complicated due to the existence of several dynamic processes. Here, we consider the combined effects of localized charge carriers (polarons) and thermally activated charge carriers using a recently proposed statistical model to fit and understand the permittivity of CCTO measured at different frequencies over the whole temperature range accessible by our experiments. We found that the small permittivity at the lowest temperature is related to polaron frozen, while at higher temperatures the rapid increase is associated with the thermal excitation of polarons inducing the Maxwell-Wagner effect, and the final increase of the permittivity is attributed to the thermally activated conductivity. Such analysis enables us to separate the contributions from localized polarons and conductive charge carriers and quantify their activation energies.

References in corpus (10)

• High Dielectric Permittivity in AFe${}_{1/2}$B${}_{1/2}$O${}_3$ Nonferroelectric Perovskite Ceramics (A - Ba, Sr, Ca; B - Nb, Ta, Sb)
• Colossal dielectric constants in single-crystalline and ceramic CaCu3Ti4O12 investigated by broadband dielectric spectroscopy
• Epitaxial Thin Films of the Giant-Dielectric-Constant Material CaCu_3Ti_4O_{12} Grown by Pulsed-laser Deposition
• Evidence for power-law frequency dependence of intrinsic dielectric response in the CaCu${}_3$Ti${}_4$O${}_{12}$
• A Novel Dielectric Anomaly in Cuprates and Nickelates: Signature of an Electronic Glassy State
• Magnetodielectric consequences of phase separation in the colossal magnetoresistance manganite Pr0.7Ca0.3MnO3
• Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4
• Polaron relaxation and hopping conductivity in LaMn${}_{1-x}$Fe${}_x$O${}_3$
• Insight into dielectric response of ferroelectric relaxors by statistical modeling
• Doping Dependence of Polaron Hopping Energies in La(1-x)Ca(x)MnO(3) (0<= x<= 0.15)

Cited by in corpus (4)

• Anomalous Behavior of the Dielectric and Pyroelectric Responses of Ferroelectric Fine-Grained Ceramics
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• Colossal dielectric response of HfxZr1-xO2 nanoparticles
• Investigating structure and physical properties of quaternary layered transition metal oxide Na2Cu2TeO6