Abstract
The dynamics of the magnetic properties of polycrystalline ${\mathrm{RuSr}}_{2}{\mathrm{Gd}}_{1.5}{\mathrm{Ce}}_{0.5}{\mathrm{Cu}}_{2}{\mathrm{O}}_{10\ensuremath{-}\ensuremath{\delta}}$ (Ru-1222) have been studied by ac susceptibility and dc magnetization measurements, including relaxation and ageing studies. Ru-1222 is a reported magnetosuperconductor with Ru spins magnetic ordering at temperatures near 100 K and superconductivity in $\mathrm{Cu}\ensuremath{-}{\mathrm{O}}_{2}$ planes below ${T}_{c}\ensuremath{\sim}40\mathrm{K}.$ The exact nature of Ru spins magnetic ordering is still being debated, and no conclusion has been reached yet. In this work, a frequency-dependent cusp was observed in ${\ensuremath{\chi}}_{\mathrm{ac}}$ vs T measurements, which is interpreted as a spin glass transition. The change in the cusp position with frequency follows the Vogel-Fulcher law, which is commonly accepted to describe a spin-glass with magnetically interacting clusters. Such an interpretation is supported by thermoremanent magnetization (TRM) measurements at $T=60\mathrm{K}.$ TRM relaxations are well described by a stretched exponential relation, and present significant aging effects.
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