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

Abstract

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.

12 pages, 5 figures

References in corpus (5)

• Colossal dielectric constant up to GHz at room temperature
• Charge transfer in the high dielectric constant materials CaCu3Ti4O12 and CdCu3Ti4O12
• Interfacial contribution to the dielectric response in semiconducting LaBiMn4/3Co2/3O6
• Magnetic ordering in the striped nickelate La5/3Sr1/3NiO4: A band structure point of view
• Stripe segregation and magnetic coupling in the nickelate La_5/3 Sr_1/3 NiO_4

Cited by in corpus (4)

• Colossal dielectric constants in transition-metal oxides
• Dielectric signature of charge order in lanthanum nickelates
• Nature and impact of stripe freezing in La${}_{1.67}$Sr${}_{0.33}$NiO${}_4$
• Nanoscale inhomogeneity of charge density waves dynamics in La${}_{2-x}$Sr${}_x$NiO${}_4$