Metal-to-insulator transition and magnetic ordering in CaRu1-xCuxO3

I. M. Bradarić, I. Felner, M. Gospodinov

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

CaRuO3 is a 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 a spinglass-like transition develops for x≤7 at. % Cu. The obtained value for the effective magnetic moment peff =3.55/μB for an x=5 at. % Cu single crystal, indicates the presence of Ru5+. 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 Cu2+/3+ substitution, induces the appearance of Ru5+ 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.

Original languageEnglish
Article number024421
Pages (from-to)244211-244216
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number2
StatePublished - 1 Jan 2002

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