Oxygen-vacancy-induced charge redistribution in the CuO<sub>2</sub> planes of non-stoichiometric RBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> (0<x<1) determined by neutron crystal-field spectroscopy
A Furrer; P Allenspach; A Furrer; Lab. fur Neutronenstreuung, Eidgenossische Technische Hochschule Zurich, Wurenlingen, Switzerland; P Allenspach; Lab. fur Neutronenstreuung, Eidgenossische Technische Hochschule Zurich, Wurenlingen, Switzerland
Журнал:
Journal of Physics: Condensed Matter
Дата:
1989-06-12
Аннотация:
Neutron crystal-field spectroscopy as a probe of the local symmetry at the rare-earth site in non-stoichiometric RBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>(0<x<1) is introduced. The oxygen vacancy concentration x includes charge redistributions that are modelled by virtual distortions of the oxygen ordering in the CuO<sub>2</sub> planes. The model assumptions are quantitatively accounted for by neutron spectroscopic data obtained for HoBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> (x=0.2, 0.8). Some implications of the observed charge redistributions on the superconducting properties are discussed.
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