title: Magneto-structural study of a Cr-doped CaRuO(3).
abstract: Temperature-dependent neutron powder diffraction, magnetization and XPS studies were carried out on an optimally Cr-doped CaRuO(3), i.e. CaRu(0.85)Cr(0.15)O(3) (CRC-15). XPS data revealed that Cr exist in 3+ and 6+ oxidation states. The charge dissociation preserves the overall 4+ nominal charge of the Ru site. Although ferromagnetic correlations develop around 100 K, the system exhibits a large coercive field below 50 K. The unit cell volume exhibits negative thermal expansion below 50 K since the lattice expansion due to the magnetostrictive effect outweighs the thermal contraction due to the phonon-driven mechanism.
authors.affiliation: Department of Materials Science, Indian Institute of Science, Bangalore 560012, India.
authors.forename: Rajeev
authors.initials: R
authors.lastname: Ranjan
authors.forename: Rohini
authors.initials: R
authors.lastname: Garg
authors.forename: Anatoliy
authors.initials: A
authors.lastname: Senyshyn
authors.forename: M S
authors.initials: MS
authors.lastname: Hegde
authors.forename: Helmut
authors.initials: H
authors.lastname: Ehrenberg
authors.forename: Hans
authors.initials: H
authors.lastname: Boysen