Volume 84, Number 6, December 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 January 2009|
Anisotropic superconducting properties of the aligned Sm0.95La0.05FeAsO0.85F0.15 microcrystalline powder
Department of Physics, National Tsing Hua University - Hsinchu 30013, Taiwan
2 Department of Physics, National Taiwan Normal University - Taipei 11677, Taiwan
3 Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China - Hefei 230026, China
Corresponding author: email@example.com
Accepted: 18 November 2008
The Sm0.95La0.05FeAsO0.85F0.15 compound is an anisotropic superconductor with a superconducting transition temperature Tc = 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 Ba and c-axis along the rotation axis. Anisotropic superconducting properties with anisotropic diamagnetic ratio ~ 2.4 was observed from low-field susceptibility and magnetization . The anisotropic low-field phase diagram with the variation of lower critical field gives a zero-temperature penetration depth = 521 nm and = 172 nm. The superconducting anisotropy parameter of 3.0 was obtained for this aligned microcrystalline powder.
PACS: 74.70.-b – Superconducting materials / 75.30.Fv – Spin-density waves / 75.30.Gw – Magnetic anisotropy
© EPLA, 2008
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