Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/102150
Type: Artigo de periódico
Title: Spin Glass Behavior In Rusr2gd1.5ce0.5cu2 O10-δ
Author: Cardoso C.A.
Araujo-Moreira F.M.
Awana V.P.S.
Takayama-Muromachi E.
De Lima O.F.
Yamauchi H.
Karppinen M.
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.
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Rights: aberto
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0037222469&partnerID=40&md5=45a6383106439ad68e414b8b36b33a67
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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