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Increased critical current density in Nb–Ti wires having Nb artificial pinning centers

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4 Author(s)
Heussner, R.W. ; Applied Superconductivity Center, University of Wisconsin-Madison, Madison, Wisconsin 53706 ; Marquardt, J.D. ; Lee, P.J. ; Larbalestier, D.C.

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Artificial pinning center (APC) wires containing Nb 47 wt.% Ti with 24 vol.% of round Nb pins have produced very high critical current densities (Jc) which are attributed to a sharply defined, nanometer-scale Nb-pin array. By reducing both the number of warm extrusion steps from four to three and the temperature of the third extrusion from 650 °C to 250 °C, the degree of pin-matrix interdiffusion has been reduced and Jc values at all applied magnetic fields increased by 25–45% over those for a previous composite of almost identical design. The best wire achieved the very high Jc(5 T, 4.2 K) value of 4600 A/mm2. These results underscore the importance of the thermomechanical treatment in determining the maximum flux pinning properties of APC Nb–Ti wires. © 1997 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:70 ,  Issue: 7 )

Date of Publication:

Feb 1997

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