2008/06/03 by Ying Jia, Peng Cheng, Lei Fang +6 · 6 citations
Chemistry · Materials Science · Physics and Astronomy · #Inorganic Fluorides and Related Compounds #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1063/1.2963361
published as Appl. Phys. Lett. 93, 032503 (2008) · 12 pages, 4 figures, Submitted on 26 May, 2008
arxiv created 2008/06/03 · openalex publication_date 2008/07/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
By using flux method, we have grown single crystals of NdFeAsO0.82F0.18 at ambient pressures. Resistive measurements reveal a surprising discovery that the anisotropy Γ=(mc∕mab)1∕2 is below 5, which is much smaller than the theoretically calculated value. The data measured up to 400K show a curved feature, which prevents a conjectured linear behavior for an unconventional metal. The upper critical fields determined based on the Werthamer–Helfand–Hohenberg formula [N. R. Werthamer et al., Phys. Rev. 147, 295 (1966)] are Hc2ab(T=0K)≈304T and Hc2c(T=0K)≈62–70T. These high values indicate very encouraging applications of the new superconductors.