Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3
Abstract
CaRuO3 is perovskite with an orthorhombic distortion and is believed to be close to magnetic ordering. Magnetic studies of single crystal and polycrystalline CaRu1-xCuxO3 (0 x 15 at.%Cu) reveal that spin-glass-like transition develops for x 7 at.%Cu and obtained value for effective magnetic moment peff=3.55 muB for x=5 at.% Cu, single crystal, indicates presence of Ru5+. At higher Cu concentrations more complex magnetic behaviors are observed. Electrical resistivity measured on polycrystalline samples shows metal-to-insulator transition (MIT) at 51 K for only 2 at.% Cu. Charge compensation, which is assumed to be present upon Cu2+/3+ substitution, induces appearance of Ru5+ and/or creation of oxygen vacancies in crystal structure. Since the observed changes in physical properties are completely attributable to the charge compensation, they cannot be related to behaviors of pure compound where no such mechanism is present. This study provides the criterion for "good" chemical probes for studying Ru-based perovskites.
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