Abstract
Nb-Sn-Ga alloys were chosen as a model system in order to investigate the influence of third element additions on the normal and superconducting properties of alloyed Nb 3 Sn phases. With respect to compositions formed by the bronze process (with Ga added to the Cu Sn matrix) alloys with concentrations close to the Sn-rich side of the A15 phase boundary were prepared. The analyses based on the GLAG theory shows that inspite of a decrease in the density of states at the Fermi level with increasing Ga content the upper critical field, B c2 , is increased due to a large enhancement of the residual resistivity. However, Ga destabilizes the stoichiometric composition of the A15 phase and the critical temperature decreases for higher Ga contents. Therefore, B c2 maximized at 1 to 1.5at% Ga for reaction temperatures at 700°C. High critical fields up to 31.5 T (at T = 4.2K) have been achieved for higher reaction temperatures, which shift the phase boundary of the A15 phase field towards stoichiometry.
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