title: Direct observation of charge order in an epitaxial NdNiO3 film.
abstract: The first direct observation of charge order of Ni(3+delta(')) and Ni(3-delta) by resonant x-ray scattering experiments in an epitaxial film of NdNiO3 is reported. A quantitative value of delta+delta(') = (0.45 +/- 0.04)e was obtained. The temperature dependence of the charge order deviates significantly from those of the magnetic moment and crystallographic structure. This might be an indication of a difference in their fluctuation time scales. These observations are discussed in terms of the temperature-driven metal-insulator transition in the RNiO3 family.
authors.affiliation: Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
authors.forename: U
authors.initials: U
authors.lastname: Staub
authors.forename: G I
authors.initials: GI
authors.lastname: Meijer
authors.forename: F
authors.initials: F
authors.lastname: Fauth
authors.forename: R
authors.initials: R
authors.lastname: Allenspach
authors.forename: J G
authors.initials: JG
authors.lastname: Bednorz
authors.forename: J
authors.initials: J
authors.lastname: Karpinski
authors.forename: S M
authors.initials: SM
authors.lastname: Kazakov
authors.forename: L
authors.initials: L
authors.lastname: Paolasini
authors.forename: F
authors.initials: F
authors.lastname: d'Acapito