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The effect of titanium content on the pinning force in Nb44wt.%Ti to Nb62wt.%Ti

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3 Author(s)
McKinnell, J.C. ; Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA ; Lee, P.J. ; Larbalestier, D.C.

The authors have been studying high Ti alloys to establish whether they offer higher low-field Jc values than Nb46.5wt.%Ti and find that they do, with values, as high as 7500 A/mm 2 at 2 T, 4.2K. They have established that the pinning centers are α-Ti precipitates for all alloys from Nb44wt.%Ti to Nb62wt.%Ti, but find a steady shift in the pinning curve peak to lower reduced fields at 4.2 K. Recently, it was shown that both ΔH c and Δκ pinning can be recognized in Nb47wt.%Ti. Since Tc and Hc vary rapidly in the high Ti alloys, ΔHc pinning should be proportionately stronger in the high Ti alloys, leading to a displacement of the peak in the pinning force curves to lower fields. The authors present pinning force data at 1.8 K and 4.2 K across the alloy range and find that while lower Ti alloys do exhibit b(1- b) behavior, the higher Ti alloys never realize b1/2(1-b)2 behavior

Published in:

Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )

Date of Publication:

Mar 1989

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