Room-temperature ferromagnetism in Sr_(1-x)Y_xCoO_(3-delta) (0.2 < x < 0.25)

Abstract

We have measured magnetic susceptibility and resistivity of Sr${}_{1-x}$Y${}_x$CoO${}_{3-\delta }$ ($x=$ 0.1, 0.15, 0.2, 0.215, 0.225, 0.25, 0.3, and 0.4), and have found that Sr${}_{1-x}$Y${}_x$CoO${}_{3-\delta }$ is a room temperature ferromagnet with a Curie temperature of 335 K in a narrow compositional range of 0.2 $\le x\le$ 0.25. This is the highest transition temperature among perovskite Co oxides. The saturation magnetization for $x=$ 0.225 is 0.25 ${\mu }_B$/Co at 10 K, which implies that the observed ferromagnetism is a bulk effect. We attribute this ferromagnetism to a peculiar Sr/Y ordering.

5 pages, 4 figures

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• La0.95Sr0.05CoO3: An efficient room-temperature thermoelectric oxide
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