Abstract
By using a two-step method, we successfully synthesized the new iron-based superconductorLaFeAsO0.9F0.1−δ. The resistive transition curves under different magnetic fields weremeasured, leading to the determination of the upper critical fieldHc2(T) of this new superconductor.The value of Hc2 at zero temperature is estimated to be about 50 T roughly. In addition, the Hall effect andmagnetoresistance were measured in a wide temperature region. A negative Hall coefficientRH has been found, implying a dominant conduction mainly by electron-like chargecarriers in this material. The charge carrier density determined at 100 K is about9.8 × 1020 cm−3, which is close to the cuprate superconductors. It is further found that the magnetoresistancedoes not follow Kohler’s law. Meanwhile, the different temperature-dependent behaviorsof resistivity, Hall coefficient and magnetoresistance have anomalous propertiesat about 230 K, which may be induced by some exotic scattering mechanism.
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