  We reviewed our various results on rutheno-cuprate magneto-superconductors
RuSr2GdCu2O8(Ru-1212) and RuSr2(Gd0.75Ce0.25)2Cu2O10(Ru-1222). It is observed,
that it is difficult to control the oxygen content of Ru-1212, though the same
is possible up to some extent for Ru-1222. Samples of both phases exhibited
superconductivity, presumably in the CuO2 plane at low temperatures coexisting
with magnetic ordering of Ru spins of predominantly antiferromagnetic type
below 140 K having a ferromagnetic component appearing below 20 K. Electrical
conductivity measurements indicate that the RuO2 layer takes part in conduction
besides the CuO2 plane. The magnetic ordering temperature of Ru spins is seen
as a clear hump in the resistivity measurements, establishing the magnetic
spins interaction with the conduction carriers. Though the bulk physical
property measurements exhibited the magneto-superconductivity, SAED results
question the same to co-existence of the two at microscopic level. Our results
indicate towards the fact that solid solutions of (Ru1-xCux)-1212, which can be
superconducting with x > 0.5, but not magnetic may be precipitating with the
stoichiometric magnetic Ru-1212 phase. Also highlighted in the review are
various existing contradictions in the literature regarding physical properties
of these systems. One such example is the results for Cp that are used as the
evidence of bulk superconductivity in Ru-1212. We believe the establishment of
superconductivity along with low-T ferromagnetic ordering of Ru spins in
intrinsically phase-pure rutheno-cuprates is yet far from conclusive.
