Flux pinning in bronze-processed Nb$sub 3$Sn
Superconducting critical currents have been measured at 4.2 $sup 0$K and applied magnetic fields up to H/subc/$sub 2$ for a series of solid-state processed-Nb$sub 3$Sn conductors. Variations were made in the alloy content of the matrix and core as well as heat-treatment times at 700 $sup 0$C to produce a wide range of superconducting critical currents. The pinning-force density, F/ subp/ (=J/subc/xB), plotted as a function of reduced field, h (=H/H/subc/$sub 2$), exhibits a peak, F/subp//sup max/, at a reduced field h/subp/. It is concluded that near the upper limit of pinning density to which the theory applies a sharp increase in F/subp//sup max/ may occur without significant shifts in h/subp/ to lower values. This result is added to the model's prediction for lower pinning-density materials, i.e., when lower values of F/subp//sup max/ increase there is a shift in h/subp/ to smaller values.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- NSA Number:
- NSA-33-030234
- OSTI ID:
- 4034279
- Journal Information:
- J. Appl. Phys., v. 47, no. 4, pp. 1459-1463, Journal Name: J. Appl. Phys., v. 47, no. 4, pp. 1459-1463; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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