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Type: Artigo de periódico
Title: Spin glass behavior in RuSr2Gd1.5Ce0.5Cu2O10-delta
Author: Cardoso, CA
Araujo-Moreira, FM
Awana, VPS
Takayama-Muromachi, E
de Lima, OF
Yamauchi, H
Karppinen, M
Abstract: The dynamics of the magnetic properties of polycrystalline RuSr2Gd1.5Ce0.5Cu2O10-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 Cu-O-2 planes below T(c)similar to40 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 chi(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 K. TRM relaxations are well described by a stretched exponential relation, and present significant aging effects.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.67.020407
Date Issue: 2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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