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Superconducting Properties and Microstructures of {\rm MgB}_{2} Thin Films Fabricated With the Precursor and Post-Annealing Method

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5 Author(s)
Matsumoto, A. ; Nat. Inst. for Mater. Sci., Tsukuba, Japan ; Takahashi, K.-i. ; Tachiki, M. ; Kitaguchi, H.
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The critical current densities (J c) of MgB2 thin films deposited on alpha-Al2O3 fabricated with a precursor and post-annealing process have been investigated in high magnetic fields of up to 30 T. The H c2(0) estimated from the resistivity measurements was ~45 T. High J c values were obtained at 4.2 K in external magnetic fields applied parallel to the film surface. These values were comparable to that of Nb3Sn in fields up to 18 T and surpassed them in fields over 18 T. To reduce the number of droplets, the Eclipse PLD method was one of the most useful techniques.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )