2009/09/29 by Minghu Fang, M. H. Fang, J. H. Yang +15 · 2 citations
Materials Science · Physics and Astronomy · #Computer science #Iron-based superconductors research #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.81.020509
published as Phys. Rev. B 81, 020509(2010) · 4 pages, 4 figures, submit to PRL
arxiv created 2009/09/29 · openalex publication_date 2010/01/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have determined the resistive upper critical field Hc2 for single crystals of the superconductor Fe1.11Te0.6Se0.4 using pulsed magnetic fields of up to 60 T. A rather high zero-temperature upper critical field of \ensuremathμ0Hc2(0)\ensuremath≈47 T is obtained in spite of the relatively low superconducting transition temperature (Tc\ensuremath≈14 K). Moreover, Hc2 follows an unusual temperature dependence, becoming almost independent of the magnetic field orientation as the temperature T\ensuremath→0. We suggest that the isotropic superconductivity in Fe1.11Te0.6Se0.4 is a consequence of its three-dimensional Fermi-surface topology. An analogous result was obtained for (Ba,K)Fe2As2, indicating that all layered iron-based superconductors exhibit generic behavior that is significantly different from that of the ``high-Tc'' cuprates.