Abstract
Spin glass magnetic properties are found in a ceramic sample of YBa 2(Cu 0.75Fe 0.25) 3O 7+ y . These include a clear separation between the field cooled and zero field cooled magnetization vs temperature curves, a nonlinear M vs H magnetization curve, with hysteresis and a remanent moment, and a logarithmic time decay of the remanent moment. The freezing temperature of 36K is consistent with Mossbauer and neutron scattering experiments showing spin glass behavior in these materials. Finally an additional rather sharp magnetic transition is observed at 3.2 K.
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