Effects of Structural Disorder and Charge Carriers on the Magnetic and Transport Properties of Sr0.7$R_{0.3}$CoO3-\delta ($R = \text{Y}$ or Dy0.45Er0.55)

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概要

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• Research into the magnetic and transport properties of Sr0.7$R_{0.3}$CoO3-\delta ($R = \text{Y}$ or Dy0.45Er0.55) having tetragonal $I4/mmm$ symmetry with oxygen-deficient CoO2(1-\delta) (001) planes alternating with CoO2 planes, as in the brownmillerite structure, has shown that the localized 3d6 Co(III) configurations are not easily oxidized and that the n-type conduction is not realized owing to the small polaron Co(II). A ferromagnetic transition temperature decreases with increasing oxygen deficiency as well as with increasing disorder at the $R$ site. The electrical resistivity ($\rho$) decreases with increasing carrier concentration ($n$), whereas $\rho$ is independent of the $R$-site disorder. The thermoelectric power, on the other hand, varies with both $n$ and the disorder. Although the phonon contribution to the thermal conductivity is suppressed, the polaronic conduction makes these compounds unsuitable for thermoelectric-power applications.

• 2011-01-25

著者

• Takami Tsuyoshi

  Texas Materials Institute, University of Texas at Austin, 1 University Station, C2201, Austin, TX 78712, U.S.A.

関連論文

• Effects of Structural Disorder and Charge Carriers on the Magnetic and Transport Properties of Sr0.7$R_{0.3}$CoO3-\delta ($R = \text{Y}$ or Dy0.45Er0.55)

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