Charge order, dielectric response and local structure of La5/3Sr1/3NiO4 system

Details Charge order, dielectric response and local structure of La5/3Sr1/3NiO4 system Charge order, dielectric response and local structure of La5/3Sr1/3NiO4 system

2009-01-22

arxiv.org/abs/0901.3373v2

JOURNAL OF APPLIED PHYSICS 106, 104116 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 5 figures

Scientific paper

10.1063/1.3260222

Charge ordering, dielectric permittivity and local structure of La5/3Sr1/3NiO4 system have been explored X-ray charge scattering, complex dielectric impedance spectroscopy, and extended X-ray absorption fine structure (EXAFS) measurements, made on the same single crystal sample. The local structure measured by the temperature dependent polarized Ni K-edge EXAFS shows significant distortions in the NiO2 planes. These local distortions could be reasonable cause of high dielectric permittivity of the title system (e=100 at 5K) with the charge ordering in this system being a ferroelectric-like second order transition.

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