  Studied 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10 (Ru-1222) compound
crystallized in a tetragonal I4/mmm space group crystal structure.
Thermo-gravemetric (TG) analysis of the compound showed the release of oxygen
and breaking to metallic constituents in two distinct steps at around 350 and
500 0C. The DC magnetization data (M vs. T) revealed magnetic transition at 100
K followed by superconducting transition at 40 K. Low field M vs. H hysteresis
loop showed a lower critical field (Hc1) value of around 25 Oe. Ferromagnetic
component is evidenced at 5, 10, 20 and 40 K. Near saturation field of above 5
Tesla is observed at 5 K. Zero-field returning moment (Mr) and zero-moment
coercive field (Hc) values at 5 K are 0.35mB and 250 Oe. The resistance vs.
temperature (R vs. T) behaviour of the sample confirmed superconductivity at
around 43 K. Superconductivity transition (Tc) is broadened under magnetic
field with strong granularity like steps.
