  The Ru0.9Sr2YCu2.1O7.9 sample being synthesized by high-pressure
high-temperature solid-state reaction underwent (weak) ferromagnetic transition
at 150 K followed by superconducting transition at 30 K. It showed clear
Meissner signal in the field-cooled process up to external magnetic field of a
few hundred Oe (~300 Oe). The magnetic susceptibility data and magnetic
hysteresis data could be explained assuming that the sample was a macroscopic
mixture of a superconductor and a (weak) ferromagnet. Any anomalous behaviour
implying the coexistence of superconductivity and magnetism on a microscopic
scale was not observed.
