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Structure and magnetic properties of (Gd, Y)0.33Sr0.67CoO3-δ compounds

Yufeng Zhang 1Sho Sasaki 1Osami Yanagisawa 2Mitsuru Izumi 1

1. Tokyo Univ of Marine Science and Technology (TUMSAT), 2-1-6, Etchu-jima, Koto-ku, Tokyo 1358533, Japan
2. Yuge Natinal College of Maritime Technology (YMCNT), Ehime 7942593, Japan


We have studied the structure and magnetic properties of the A0.33Sr0.67CoO3-δ (A=Y, Gd) samples. X-ray diffraction and Rietveld refinement show that the structure is the perovskite-type structure with layered alternate ion of CoO6 octahedron and CoO4 tetrahedral polyhedron. In the Y-doped sample, a magnetization jump was observed around 180 K below the Curie temperature TC = 304 K during the magnetic field cooling. The magnetization jump may be associated with the onset of antiferromagnetism appeared as the Co3+ ion orbital ordering state with the intermediate spin state. The Gd-doped sample exhibits higher magnetization and lower Curie temperature than Y-doped sample. The field magnetization vs temperature curve reveals a reentrant paramagnetic behavior below 100 K, which comes from the spin state transition of Co3+ ion from intermediate to low spin configuration.

Keywords: Strontium doped cobaltite, Perovskite structure, Spin State transition, Thermal hysteresis


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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium K, by Yufeng Zhang
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-06-05 09:19
Revised:   2009-06-07 00:44