Resistivity, thermopower, Hall coefficient, and magnetization are measured for a set of polycrystalline samples of the room-temperature ferromagnet Sr 1-xYxCoO3-δ up to 800 K. A peculiar metallic state accompanied by a large effective magnetic moment of 3.40 μB/Co is observed above 600 K, indicating that electrons on the Co3+ ions are magnetic and itinerant. The magnetic Co3+ ions survive at low temperatures, which causes the ferromagnetism below 335 K. We attribute this to the large CoO6 octahedra stabilized in the A-site ordered structure.
- A-site ordered structure
- Cobalt oxide
- High-temperature metallic state
- Room-temperature ferromagnetism
ASJC Scopus subject areas
- Physics and Astronomy(all)