Dependence of critical current densities in Chevrel phase superconducting wires on magnetic fields up to 25 T

V-I characteristics have been measured, in several monofilamentry Chevrel phase superconductors (CPS) wires made using prereacted powders of both pure SnMo6S8 (SMS) and Pb0.6Sn0.4Mo6S8 (PSMS) compounds, in applied magnetic fields up to 25 T. The values of Jc in different wires lie in the range similar 5x107-109 A/m2 at 4.2 K and 9 T. In the SMS wires the critical current density Jc(B) tends to vanish at the expected ideal Bc2 . In contrast, for PSMS wires the Jc(B) tends to vanish at fields much smaller than the expected Bc2 for pure PbMo6S8 (PMS) and nearer to that of the SMS. The V-I characteristics at the dissipative onset are highly non-linear and show a power law behaviour V=kIn with a typical n-value (1.8 K, 25 T)>17. (orig.)