Charge Ordering in Manganite and Ferrite Systems

Microstructure of bilayer manganite PrCa2Mn2O7 showing charge/orbital ordering

ordering Zhanbing He, He Tian, Guochu Deng, Qiang Xu, and Gustaaf Van Tendeloo Electron Microscopy for Materials Research (EMAT), University of Antwerp, Groenenborgerlaan 171, Antwerp B-2020, Belgium Laboratory for Developments and Methods, Paul Scherrer Institute, CH-5232 Villigen, Switzerland Bragg Institute, Australian Nuclear Science and Technology Organization, New Illawarra Road, Lucas He...

Chemically induced Jahn-Teller ordering on manganite surfaces.

Physical and electrochemical phenomena at the surfaces of transition metal oxides and their coupling to local functionality remains one of the enigmas of condensed matter physics. Understanding the emergent physical phenomena at surfaces requires the capability to probe the local composition, map order parameter fields and establish their coupling to electronic properties. Here we demonstrate t...

On charge and orbital ordering in La0.5Sr1.5MnO4

Using first principle band structure calculations, we critically examine results of resonant x-ray scattering experiments which is believed to directly probe charge and orbital ordering. Considering the specific case of La0.5Sr1.5MnO4, we show that this technique actually probes most directly and sensitively small structural distortions in the system. Such distortions, often difficult to detect...

Charge and Sodium Ordering in β-Na0.33V2O3

The recent discovery [1] of a clear metal– insulator transition (MIT) in the vanadium bronze βNa0.33V2O3 has sparked a revival of interest in this quasi one-dimensional(1D) metallic system. In addition to the MIT, β-Na0.33V2O3 undergoes a structural sodium ordering transition at higher temperatures, a magnetic transition at low temperatures, and a transition into a superconducting state under h...

Charge transfer transitions in multiferroic BiFeO3 and related ferrite insulators