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|Type:||Artigo de periódico|
|Title:||Spin Glass Behavior In Rusr2gd1.5ce0.5cu2 O10-δ|
De Lima O.F.
|Abstract:||The dynamics of the magnetic properties of polycrystalline polycrystalline RuSr2Gd1.5CeO.5Cu2 O10-δ (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 Cu-O2 planes below Tc∼40 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 Xac 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 K. TRM relaxations are well described by a stretched exponential relation, and present significant aging effects.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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