  Mo-substituted triple perovskite superconducting samples with the
stoichiometric composition La(1.5)Nd(0.5)Ca(1)Ba(2)[Cu(1-x)Mo(x)](5)O(z),
[LNCBCuMO] with x = 0.00, 0.01, 0.03, 0.05 and 0.10, have been investigated
using X-ray diffraction, electrical resistivity, magnetic susceptibility,
magnetization and oxygen content measurements. The observed reduction in Tc
with increasing Mo content (x) in LNCBCuMO, can be attributed to the decrease
in hole concentration. Magnetization measurements as a function of temperature
and field (H), exhibit an M-H hysteresis loop, which indicates moderate flux
pinning, which can be attributed to the pinning centers created by Mo
substitution at Cu sites. The critical current density, Jc, deduced from the
M-H data satisfies the flux creep model.
