We have studied the structure and magnetic properties of the A_0.33Sr_0.67CoO_3-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 T_C = 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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