Anomaly in the dielectric response at the charge-orbital-ordering transition ofPr0.67Ca0.33MnO3

2003/04/30 by Silvana Mercone, Alexandre Wahl, A. Wahl +5 · 1 citation
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #High-pressure geophysics and materials #Magnetic and transport properties of perovskites and related materials #Solid-state spectroscopy and crystallography #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.69.174433

pdf file

arxiv created 2004/02/09 · openalex publication_date 2004/05/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The complex impedance of a Pr_0.67Ca_0.33MnO₃ crystal has been measured. The frequency dependence is studied for a wide range of temperatures (50--403 K) and is found to be characteristic of relaxation process with a single Debye time relaxation constant, which is interpreted as a dielectric constant of the material. A strong peak is observed in this dielectric constant (up to 10⁶) at the charge ordering transition suggesting an interpretation in terms of ordering electric dipoles at T_CO or in term of phase separation. Comparison with Pr_0.63Ca_0.37MnO₃---in which the phase separation is much smaller and the peak in the dielectric constant is absent---suggests an interpretation in term of phase separation between insulating and metallic states.

Citations

• Ferromagnetic zigzag chains and properties of the charge-ordered perovskite manganites
• Nonlinear electrical response in a charge/orbital orderedPr0.63Ca0.37MnO3crystal: The charge density wave analogy

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