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

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

2003-07-31

arxiv.org/abs/cond-mat/0307764v3

Physics

Condensed Matter

Materials Science

The original version, submitted on 31 July 2003, has been replaced, because the role of extrinsic effects is now taken into ac

Scientific paper

10.1063/1.1834998

We are reporting the dielectric response of La1.5Sr0.5NiO4, a system that presents a charge-ordered state above room temperature and a rearrangement of its charge-order pattern in the temperature region 160-200 K. A careful analysis of the role of the electric contacts used, sample thickness and grain size on the experimental data allows us to determine that this material exhibits high values of intrinsic dielectric constant. The variation of the dielectric constant with temperature shows a maximum in the region of the rearrangement of the charge-order pattern, which constitutes an evidence of the link between both phenomena.

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