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Enhanced critical current density in multifilamentary NbTi/Cu superconductors with highly aligned artificial pinning center

Physica C Superconductivity
Publication Date
DOI: 10.1016/j.physc.2004.02.216
  • Artificial Pinning Center
  • Highly Aligned Structure
  • Critical Current Density
  • Physics


Abstract Three forms of Nb artificial pinning centers (APC), that is barrier-shaped, layer-shaped and island-shaped pins, were introduced into multifilamentary NbTi/Cu superconductors, and the wires were rolled into different aspect ratios. The critical current densities ( J c∥) were enhanced at high aspect ratio of tape when the broad face of the NbTi/Cu tapes is parallel to the magnetic field for all three types of APC tapes. The highest critical current density increased to more than 4010 A/mm 2 at 5 T, 4.2 K in NbTi/Cu tapes with Nb island-shaped. Moreover, the critical field ( H c2) were also changed in multifilamentary NbTi/Cu tapes with highly aligned Nb artificial pinning centers in different forms when the tapes have different aspect ratio as well as have different orientation (parallel and perpendicular) with magnetic field.

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