Direct observation of charge order in an epitaxial NdNiO3 film.
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.
Staub
U
U
Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
Meijer
G I
GI
Fauth
F
F
Allenspach
R
R
Bednorz
J G
JG
Karpinski
J
J
Kazakov
S M
SM
Paolasini
L
L
d'Acapito
F
F