2008/07/17 by B. C. Chang, C. H. Hsu, Y. Y. Hsu +4
Chemistry · Materials Science · Physics and Astronomy · #Inorganic Fluorides and Related Compounds #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/84/67014
4 pages, 6 figures
arxiv created 2008/07/17 · openalex publication_date 2008/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The Sm 0.95 La 0.05 FeAsO 0.85 F 0.15 compound is an anisotropic superconductor with a superconducting transition temperature T c =52 K. Due to the Fe spin-orbital related anisotropic exchange coupling, the tetragonal microcrystalline powder can be aligned at room temperature using the field-rotation method where the tetragonal ab -plane is parallel to the aligned magnetic field B a and c -axis along the rotation axis. Anisotropic superconducting properties with anisotropic diamagnetic ratio χ c /χ ab ∼2.4 was observed from low-field susceptibility χ( T ) and magnetization M ( B a ). The anisotropic low-field phase diagram with the variation of lower critical field gives a zero-temperature penetration depth λ c (0)=521 nm and λ ab (0)=172 nm. The superconducting anisotropy parameter γ=λ c /λ ab of 3.0 was obtained for this aligned microcrystalline powder.