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Magnetic Properties of Oxygen Deficient Y_{0.33}Sr_{0.67}CoO_{3-δ}

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Zhang Y., Sasaki S., Yanagisawa O., Izumi M.

Acta Physica Polonica A

2007

vol. 111

issue 1

79-86

We studied magnetic properties of perovskite-type Y_{0.33}Sr_{0.67} CoO_{2.614} and Y_{0.33}Sr_{0.67}CoO_{2.707} prepared under different sintered temperatures at 1250ºC and 1100ºC, respectively. A dc magnetization jump associated with a large thermal hysteresis around 180 K was found in Y_{0.33}Sr_{0.67}CoO_{2.614}, which indicates a kind of magnetic memory effect. On the other hand, Y_{0.33}Sr_{0.67}CoO_{2.707} shows a larger magnetization with a small magnetization jump around 200 K and lower Curie temperature than those of Y_{0.33}Sr_{0.67}CoO_{2.614}. Rich Co^{3+} ions in the low temperature sintered Y_{0.33}Sr_{0.67}CoO_{2.707} possibly introduce large magnetization and high magnetization jump temperature. This may be coming from a surface/volume effect of Co^{3+} ions appearing in the polycrystalline sample prepared at low temperature. The ferromagnetism resulted from the different surface/volume ratio contributes to a part of magnetization and may result in the change of the Curie temperature.

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1 Acta Physica Polonica A

1 2007

1 Izumi M.

1 Sasaki S.

1 Yanagisawa O.

1 Zhang Y.

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Magnetic Properties of Oxygen Deficient Y_{0.33}Sr_{0.67}CoO_{3-δ}