2008/07/31 by M. M. Altarawneh, M. Altarawneh, K. Collar +5 · 180 citations
Materials Science · Physics and Astronomy · #Anisotropy #Curvature #Iron-based superconductors research #Magnetic field #Penetration depth #Perpendicular #Physics of Superconductivity and Magnetism #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.78.220505
published in Physical Review B 78(22) (American Physical Society) · published version
openalex publication_date 2008/12/16 · arxiv created 2008/12/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The radio frequency penetration depth was measured in the superconductor (Ba0.55K0.45)Fe2As2 under pulsed magnetic fields extending to 60 T and down to 14 K. Using these data we are able to infer a Hc2(T), H\text\ensuremath-T phase diagram, for applied fields parallel and perpendicular to the crystallographic c axis. The upper critical-field curvature is different for the respective orientations, but they each remains positive down to 14 K. The upper critical-field anisotropy is moderate, \ensuremath≈3.5 close to Tc, and drops with the decrease in temperature, reaching \ensuremath≈1.2 at 14 K. These data and analysis indicate that (i) (Ba0.55K0.45)Fe2As2 anisotropy diminishes with temperature and has an unusual temperature dependence and (ii) Hc2(T=0) for this compound may easily approach fields of 75 T.