Magnetic and transport properties of high-pressure synthesized perovskite cobalt oxide (Sr{sub 1-x}Ca{sub x})CoO{sub 3} (0=<x=<0.8)
- Superconducting Materials Center, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
Polycrystalline perovskite cobalt oxides (Sr{sub 1-x}Ca{sub x})CoO{sub 3} (0=<x=<0.8) were synthesized under high pressure (6GPa) and high temperature (1200-1300 deg. C) conditions. Powder X-ray diffraction data confirmed that they have cubic perovskite structures. The end member of the solid solution, SrCoO{sub 3}, exhibited a ferromagnetic transition with Curie temperature of T{sub c}{approx}266K and metallic electric conductivity. With increasing the Ca content x, T{sub c} increased slightly to 286K at x=0.2 then decreased rapidly to 148K for x=0.8. The origin of the ferromagnetism is discussed in relation to the spin state of the Co{sup 4+} ions. The present system showed a relatively large ({approx}5.5%) negative magnetoresistance for x=0 or 0.2 in the vicinity of T{sub c}.
- OSTI ID:
- 20784780
- Journal Information:
- Journal of Solid State Chemistry, Vol. 178, Issue 11; Other Information: DOI: 10.1016/j.jssc.2005.08.019; PII: S0022-4596(05)00392-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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