title: Unexpected effect of Ru-substitution in lightly doped manganites.
abstract: In this communication we report the unexpected effect of ruthenium doping in sodium lightly doped manganites. This effect seems to be in contrast with the usual model applied to describe the effect of this magnetic ion into the manganite structure. We propose a possible compensation mechanism which seems also able to describe other peculiar features encountered in these materials.
authors.affiliation: Department of Physical Chemistry "M Rolla", University of Pavia, 27100 Pavia, Italy. lorenzo.malavasi@unipv.it
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Malavasi
authors.forename: M Cristina
authors.initials: MC
authors.lastname: Mozzati
authors.forename: Cristina
authors.initials: C
authors.lastname: Tealdi
authors.forename: M Rosa
authors.initials: MR
authors.lastname: Pascarelli
authors.forename: Carlo B
authors.initials: CB
authors.lastname: Azzoni
authors.forename: Giorgio
authors.initials: G
authors.lastname: Flor