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Giant ferromagnetic hall coefficient in La_0.5Ca_0.5CoO_3

机译:La_0.5Ca_0.5CoO_3中的巨型铁磁霍尔系数

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We report the studies of the Hall effect and magnetic properties in La_0.5Ca_0.5CoO_3 thin films and ceramics. We use the local Hal probe and SQUID magnetometers to measure the magnetization M of the smaples. Both below and above the Curie temperature, the Hall resistivity rho _xy(H) is shown to be proportional to M(H) (H is the applied magnetic field). Thus, our results provide convincing evidence for the anomalous Hall effect in these cobaltites. The value of the anomalous Hall coefficient R_s in La_0.5Ca_0.5CoO_3 significantly exceeds those of other known single-phase ferromagnetic metals. We suggest that the coexistence of high- and low-spin configurations in the perovskite cobaltites, which gives rise to magnetic percolation behavior in La_1-xCa_xCoO_3, may be responsible for the giant R-s.
机译:我们报告了La_0.5Ca_0.5CoO_3薄膜和陶瓷中霍尔效应和磁性能的研究。我们使用当地的Hal探头和SQUID磁力计来测量枫木的磁化强度M。在居里温度以下和以上,霍尔电阻rho_xy(H)与M(H)成正比(H是施加的磁场)。因此,我们的结果为这些钴矿中的异常霍尔效应提供了令人信服的证据。 La_0.5Ca_0.5CoO_3中的异常霍尔系数R_s的值大大超过其他已知的单相铁磁金属。我们建议钙钛矿型钴矿中高自旋和低自旋构型的共存会引起La_1-xCa_xCoO_3的磁渗行为,这可能是巨大的R-s的原因。

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