Abstract
An Ru 0 . 9 Sr 2 YCu 2 . 1 O 7 . 9 sample synthesized by high-pressure high-temperature solid-state reaction underwent (weak) ferromagnetic transition at ∼150 K followed by a bulk superconducting transition at ∼30 K. It showed a clear Meissner signal in the field-cooled process up to external magnetic field of a few hundred Oe (∼300 Oe). These results appear to indicate coexistence of bulk superconductivity and ferromagnetism. At the same time, both magnetic-susceptibility and hysteresis data can be interpreted as mere superimposition of superconducting diamagnetic and (weak) ferromagnetic responses without any anomalous behavior. The genuine coexistence of bulk superconductivity and ferromagnetism in this compound might not yet be conclusive.
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