High-Temperature Metallic State of Room-Temperature Ferromagnet Sr 1- x Y x CoO 3-δ
2006; Physical Society of Japan; Volume: 75; Issue: 10 Linguagem: Inglês
10.1143/jpsj.75.103702
ISSN1347-4073
AutoresWataru Kobayashi, S Yoshida, Ichiro Terasaki,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoResistivity, thermopower, Hall coefficient, and magnetization are measured for a set of polycrystalline samples of the room-temperature ferromagnet Sr 1- x Y x CoO 3-δ up to 800 K. A peculiar metallic state accompanied by a large effective magnetic moment of 3.40 µ B /Co is observed above 600 K, indicating that electrons on the Co 3+ ions are magnetic and itinerant. The magnetic Co 3+ ions survive at low temperatures, which causes the ferromagnetism below 335 K. We attribute this to the large CoO 6 octahedra stabilized in the A-site ordered structure.
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