Weak anisotropy of the superconducting upper critical field in Fe 1.11Te0.6Se0.4 single crystals

Minghu Fang, Jinhu Yang, F. F. Balakirev, Y. Kohama, J. Singleton, B. Qian, Z. Q. Mao, Hangdong Wang, H. Q. Yuan

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Abstract

We have determined the resistive upper critical field Hc2 for single crystals of the superconductor Fe1.11Te0.6Se 0.4 using pulsed magnetic fields of up to 60 T. A rather high zero-temperature upper critical field of μ0 Hc2 (0) 47 T is obtained in spite of the relatively low superconducting transition temperature (Tc 14K). Moreover, Hc2 follows an unusual temperature dependence, becoming almost independent of the magnetic field orientation as the temperature T→0. We suggest that the isotropic superconductivity in Fe 1.11Te0.6Se0.4 is a consequence of its three-dimensional Fermi-surface topology. An analogous result was obtained for (Ba,K) Fe2 As2, indicating that all layered iron-based superconductors exhibit generic behavior that is significantly different from that of the "high- Tc " cuprates.

Original languageEnglish (US)
Article number020509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number2
DOIs
StatePublished - Jan 27 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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