Pinning properties of commercial Nb-Ti wires described by a 2-components model

Luigi Muzzi, Gianluca De Marzi, Chiarasole Fiamozzi Zignani, Luigi Affinito, Mathieu Napolitano, Rosario Viola, César Octavio Dominguez, Luca Bottura, Sandrine Le Naour, David Richter, Antonio Della Corte

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Abstract

We report on the magnetic and transport characterization of different NbTi commercial strands, carried out at variable temperature and magnetic field. From the critical current densities extracted from transport measurements and magnetization cycles we were able to calculate the normalized bulk pinning forces. The curves show good temperature scaling throughout the explored temperature range, and the reduced pinning force can be described by a simple two-components model system. The extension of the 2-components description of the pinning force to an expression for the critical current density gives a very good agreement with experimental measurements over the whole explored B, T range. The model works for all investigated samples, which are different in size, Cu:nonCu ratios, filament diameters and layouts. These results suggest that pinning mechanisms in conventional NbTi strands should be revised, since Nb-Ti composition gradients and grain boundaries seems to play a not negligible role. © 2006 IEEE.
Original languageEnglish
Article number5409520
Pages (from-to)1496 - 1499
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume20
Issue number3
DOIs
Publication statusPublished - Jun 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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