  The magnetic and superconducting properties of RuSr2Gd1.5Ce0.5Cu2O10-x
polycrystalline samples with different oxygen doping level are presented. A
strong suppression of the superconducting temperature (Tc), as well as a
reduction in the superconducting fraction, occurs as the oxygen content is
reduced by annealing the samples in oxygen deprived atmospheres. Drastic
changes in the electrical resistivity are observed above Tc, possibly
associated with oxygen removal mainly from grain boundaries. However, the
magnetic ordering is relatively less affected by the changes in oxygen content
of the samples. The spin glass transition is enhanced and shifted to higher
temperatures with the reduction in oxygen content. This could be correlated
with an increase in the spins disorder and frustration for the oxygen depleted
samples. Also, the same oxygen vacancy induced disorder could explain the
reduction in the fraction of the sample showing antiferromagnetic order. We
also report significant changes in the measured properties of the samples as a
function of time.
