Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 21, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/21/10/105001
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Funding
- Natural Science Foundation of China
- Ministry of Science and Technology of China [2006CB01000, 2006CB921802]
- Chinese Academy of Sciences
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By using a two-step method, we successfully synthesized the new iron-based superconductor LaFeAsO0.9F0.1-delta. The resistive transition curves under different magnetic fields were measured, leading to the determination of the upper critical field H-c2(T) of this new superconductor. The value of H-c2 at zero temperature is estimated to be about 50 T roughly. In addition, the Hall effect and magnetoresistance were measured in a wide temperature region. A negative Hall coefficient R-H has been found, implying a dominant conduction mainly by electron-like charge carriers in this material. The charge carrier density determined at 100 K is about 9.8 x 10(20) cm(-3), which is close to the cuprate superconductors. It is further found that the magnetoresistance does not follow Kohler's law. Meanwhile, the different temperature-dependent behaviors of resistivity, Hall coefficient and magnetoresistance have anomalous properties at about 230 K, which may be induced by some exotic scattering mechanism.
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