Charge ordering, dielectric permittivity, and local structure of La5/3Sr1/3NiO4 system have been explored by 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 (ε ≈ 100 at 5 K) with the charge ordering in this system being a ferroelectriclike second order transition.
Charge order, dielectric response, and local structure of La5/3Sr1/3NiO4 system / Filippi, Matteo; B., Kundys; S., Agrestini; W., Prellier; H., Oyanagi; Saini, Naurang Lal. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 106:(2009), pp. 104116-1-104116-5. [10.1063/1.3260222]
Charge order, dielectric response, and local structure of La5/3Sr1/3NiO4 system
FILIPPI, Matteo;SAINI, Naurang Lal
2009
Abstract
Charge ordering, dielectric permittivity, and local structure of La5/3Sr1/3NiO4 system have been explored by 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 (ε ≈ 100 at 5 K) with the charge ordering in this system being a ferroelectriclike second order transition.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
