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Investigation of n-values of composite superconductors

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3 Author(s)
Rimikis, A. ; Inst. fur Tech. Phys., Karlsruhe Univ., Germany ; Kimmich, R. ; Schneider, Th.

Knowledge of the voltage-current characteristics of composite superconductors is very important for the development of superconducting high-field magnets, especially NMR magnets. These curves are characterized by the n-values and were systematically investigated for NbTi, (NbX)/sub 3/Sn with additional components, X, and BSSCO-2223 composite superconductors by the standard four-point measurement technique. The influence on n-values of coating the NbTi filaments with Nb as well as the dependence of n-values on the internal structure of composite NbTi and (NbX)/sub 3/Sn superconductors will be presented. The n-values of Nb/sub 3/Sn are discussed under the aspect of the heat treatment parameters reaction time and reaction temperature. The n-values of various BSCCO-2223 superconductors will also be compared.

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Applied Superconductivity, IEEE Transactions on  (Volume:10 ,  Issue: 1 )