Study of current-carrier power of massive one-phase PbMo6S8 samples with grain size about 0.1 μm

Current-carrier power of massive one-phase PbMo6S8 samples with grain size from 0.3 to 0.1 μm is investigated. The critical current density value was determined both by measuring sample magnetization by a vibration magnetometer and using the method of trapezoidal modulation of a magnetic field. Measurements were carried out in magnetic fields up to 8T at temperatures from 4.2 to 10.5 K. As a result of the studies carried out, it is concluded that in the massive one-phase PbMo6S8 samples grain boundaries are weak centers of pinning, that's why pinning center density increase (decrease of a grain size) should lead to insignificant growth of critical current, mainly, in weak magnetic fields