Dielectric response of the charge-ordered two-dimensional nickelate La1.5Sr0.5NiO4

We report the dielectric response of La1.5Sr0.5NiO4, a system that experiences charge ordering above room temperature (TCO=480K) and a rearrangement of its charge-order pattern in the temperature region 160–200K. A careful analysis of the role of the electrical contacts used, sample thickness, and g...

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Bibliographic Details
Published in:Applied physics letters 2004-12, Vol.85 (25), p.6224-6226
Main Authors: Rivas, J., Rivas-Murias, B., Fondado, A., Mira, J., Señarís-Rodríguez, M. A.
Format: Article
Language:English
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Summary:We report the dielectric response of La1.5Sr0.5NiO4, a system that experiences charge ordering above room temperature (TCO=480K) and a rearrangement of its charge-order pattern in the temperature region 160–200K. A careful analysis of the role of the electrical contacts used, sample thickness, and grain size on the experimental data allows us to determine that this material exhibits a high intrinsic dielectric constant. In addition, the temperature dependence of the dielectric constant, that shows a maximum in the region of the rearrangement of the charge-order pattern, points to a link between the two phenomena.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1834998