Intrinsic pinning properties of FeSe0.5Te0.5 |
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| Authors: | M Migita Y Takikawa M Takeda M Uehara T Kuramoto Y Takano Y Mizuguchi Y Kimishima |
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| Institution: | 1. Department of Physics, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan;2. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan;3. Japan Science and Technology Agency, Transformative Research-Project on Iron Pnictides, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | The intrinsic pinning properties of FeSe0.5Te0.5, which is a superconductor with a critical temperature Tc of approximately 14 K, were studied through the analysis of magnetization curves obtained using an extended critical state model. For the magnetization measurements carried out with a superconducting quantum interference device (SQUID), external magnetic fields were applied parallel and perpendicular to the c-axis of the sample. The critical current density Jc under the perpendicular magnetic field of 1 T was estimated using the Kimishima model to be equal to approximately 1.6 × 104, 8.8 × 103, 4.1 × 103, and 1.5 × 103 A/cm2 at 5, 7, 9, and 11 K, respectively. Furthermore, the temperature dependence of Jc was fitted to the exponential law of Jc(0) × exp(?αT/Tc) up to 9 K and the power law of Jc(0) × (1 ? T/Tc)n near Tc. |
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