2008/03/28 by Huan Yang, Xiyu Zhu, Lei Fang +3 · 5 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Critical field #Cuprate #Electrical resistivity and conductivity #Hall effect #Iron-based superconductors research #Magnetic field #Magnetoresistance #Materials science #Physics #Rare-earth and actinide compounds #Scattering #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/21/10/105001
published as Supercond. Sci. Technol. 21 (2008) 105001 · 10 pages, 7 figures
openalex publication_date 2008/07/21 · arxiv created 2008/07/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
By using a two-step method, we successfully synthesized the new iron-based superconductor LaFeAsO 0.9 F 0.1−δ . 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 × 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.