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We report detailed magnetization measurement results for two internal-tin Nb3Sn strands. The paramagnetic background of a Mitsubishi strand is about 4 times larger than that of a KAT strand below the transition temperature, which can be understood as combined effects of Pauli and Langevin paramagnetism. From magnetic relaxation measurement for the KAT strand, a possibility of surface barrier effect is discussed. After subtracting the paramagnetic background, reversible magnetization data are analysed using the Hao-Clem model and the Ginzburg-Landau parameters (kappa), the thermodynamic and the upper critical fields (Bc,Bc2) at various temperatures are obtained. The temperature dependences of kappa, Bc and Bc2 are compared with the recent theoretical calculation results for Nb3Sn and also with widely used empirical formulas.
Date of Publication: June 2007