  We reviewed our various results on rutheno-cuprate magneto-superconductors
RuSr2GdCu2O8-d (Ru-1212) and RuSr2(Gd0.75Ce0.25)2Cu2O10-d (Ru-1222) synthesized
by NPHT process. Also reviewed are the results for HPHT synthesized various
Ln/Ru-1212, 1222 and 1232. Various important results being reported by other
international groups are incorporated and discussed critically. 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-d 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.
