High field performance of PbMo6S8superconductors

Critical currents in Chevrel-phase lead molybdenum sulphide have been measured at two temperatures as a function of applied magnetic field up to 30 T. Improved critical current densities Jc\´s were achieved with electroplating and diffusion processed PbMo6S8short-tapes. Increased Jcvalues were obtained for a short heat-treatment at 1050 °C. We find a Jcof A/cm²at 20 T and 4.2 K, and A/cm²at 20 T and 1.6 K. The dependence of Jcon grain size was also measured, and the correlation between flux pinning force and average grain size is discussed. The critical current density in the field range of < 27 T was strongly dependent on the grain size, and the critical currents at 14 T and 4.2 K can be scaled by the inverse grain size.