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Superconducting properties of SmFeAsO1−x prepared under high-pressure condition |
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| Authors: | Jing Ju Jun Tang Masanori Watahiki Hidenori Terasaki Hirotsugu Takizawa |
| Affiliation: | a WPI and Department of Physics, Graduate School of Science, Tohoku University, Japan b Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Japan c Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Japan |
| Abstract: | Synthetic conditions such as stoichiometries, temperature and pressure are optimized to achieve a high quality oxygen deficient SmFeAsO0.6 superconductor. Both electric and magnetic measurements show a sharp superconducting transition at about 55 K. Several important physical parameters are deduced. The apparent superconducting gap observed in heat capacity with 2Δo/kBTc of 4.57 larger than that of previous fluorine replaced samples indicate that this superconductivity will not strongly conflict with the phonon-mediated BCS mechanism. The mean free length ?=18.8 nm and the coherent length ξ=2.3-3.3 nm show that the superconductivity is in the clean limit. |
| Keywords: | A. Superconductors B. Inorganic compounds C. Superconductivity D. Electronic structure E. Magnetic properties |
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