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Felner, I.
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article
Metal-to-insulator transition and magnetic ordering in CaRu<SUB>1-x</SUB>Cu<SUB>x</SUB>O<SUB>3</SUB>
Abstract
CaRuO<SUB>3</SUB> is a perovskite with an orthorhombic distortion, and is believed to be close to magnetic ordering. Magnetic studies of single-crystal and polycrystalline CaRu<SUB>1-x</SUB>Cu<SUB>x</SUB>O<SUB>3</SUB> (0<=x<=15 at. %Cu) reveal that a spin-glass-like transition develops for x<=7 at. % Cu. The obtained value for the effective magnetic moment p<SUB>eff</SUB>=3.55μ<SUB>B</SUB> for an x=5 at. % Cu single crystal, indicates the presence of Ru<SUP>5+</SUP>. At higher Cu concentrations more complex magnetic behaviors are observed. Electrical resistivity measured on polycrystalline samples shows a metal-to-insulator transition at 51 K for only 2-at. % Cu. Charge compensation, which is assumed to be present upon Cu<SUP>2+/3+</SUP> substitution, induces the appearance of Ru<SUP>5+</SUP> and/or the creation of oxygen vacancies in a crystal structure. Since the observed changes in physical properties are completely attributable to the charge compensation, they cannot be related to behaviors of a pure compound where no such mechanism is present. This study provides the criterion for ``good'' chemical probes for studying Ru-based perovskites....