Magnetic flux pinning and flux jumps in polycrystalline MgB2 |
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| Authors: | Kunitoshi Murai Yoshiko Fujii Jonah Shaver |
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| Affiliation: | a Department of Applied Physics, Okayama University of Science, Ridaicho 1-1, Okayama 700-0005, Japan
b Wright State University, Dayton, OH 45435, USA |
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| Abstract: | MgB2 polycrystalline samples were fabricated under varying conditions of isostatic pressing in argon gas. The critical current densities (JC) were determined through measurements of hysteresis loops, and the highest value of JC at 10 K was 1.9 × 104 A/cm2 at 4.8 T. The depinning temperatures were measured at various magnetic fields using the vibrating reed technique. Flux jumps appeared below 7.4 K. The hysteresis loops were carefully examined to determine the temperature and magnetic field range where flux jumps appeared. |
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| Keywords: | MgB2 polycrystal Hysteresis loop Critical current density Flux jump |
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