Temperature Dependence of Upper Critical Field and Its Anisotropy Ratio of $SmFeAsO_{0.85}$ and $SmFeAsO_{0.8}F_{0.2}$ Single Crystals

Lee, Hyun-Sook (Department of Physics, Pohang University of Science and Technology) ;
Park, Jae-Hyun (Department of Physics, Pohang University of Science and Technology) ;
Lee, Jae-Yeap (Department of Physics, Pohang University of Science and Technology) ;
Kim, Ju-Young (Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
Bartkowiak, Marek (Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossendorf) ;
Kim, Jun-Sung (Department of Physics, Pohang University of Science and Technology) ;
Cho, B.K. (Materials Science and Engineering, Gwangju Institute of Science and Technology) ;
Jung, Chang-Uk (Department of Physics, Hankuk University of Foreign Studies) ;
Lee, Hu-Jong (Department of Physics, Pohang University of Science and Technology)