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Correlation of large dielectric response with the ordering transitions in PR0.67Ca0.33MnO3

Publication Type

Journal Article

Authors

Saraf, L.V., S.B. Ogale, Z. Chen, R.P. Godfrey, T. Venkatesan, Ramamoorthy Ramesh

DOI

10.1103/PhysRevB.62.R11961

Abstract

Frequency-dependent capacitance measurements and transport measurements tuned to reveal system impedance have been performed on epitaxial thin films of Pr0.67Ca0.33MnO3. These reflect strong dielectric response features correlated to the various ordering transition temperatures in the system, namely, ∼220 K (charge ordering), ∼130 K (antiferromagnetic ordering), and ∼117 K (spin canting). An equally strong feature is also seen at ∼125 K, which does not correspond to any reported transition. The enhanced dielectric response at the transitions is attributed to the nonequilibrium transport and slow carrier reorganization dynamics defined by polaronic hopping and magnetic frustration.

Journal

Physical Review B - Condensed Matter and Materials Physics

Volume

Year of Publication

2000

ISSN

01631829

Notes

cited By 8

Research Areas

Ramesh Lab