Spin Glass Behavior in RuSr2Gd1.5Ce0.5Cu2O10
Abstract
The dynamics of the magnetic properties of polycrystalline RuSr2Gd1.5Ce0.5Cu2O10 (Ru-1222) have been studied by ac susceptibility and dc magnetization measurements, including relaxation and ageing studies. Ru-1222 is a reported magneto-superconductor 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 debated and no conclusion has been reached yet. In this work, a frequency-dependent cusp was observed in ac susceptibility 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 interpretation is supported by themoremanaent magnetization (TRM) measurements at T = 60 K. TRM relaxations are well described by a stretched exponential relation, and present significant ageing effects.
Cite
@article{arxiv.cond-mat/0209593,
title = {Spin Glass Behavior in RuSr2Gd1.5Ce0.5Cu2O10},
author = {C. A. Cardoso and F. M. Araujo-Moreira and V. P. S. Awana and E. Takayama-Muromachi and O. F. de Lima and H. Yamauchi and M. Karppinen},
journal= {arXiv preprint arXiv:cond-mat/0209593},
year = {2009}
}
Comments
4 pages, 6 figures, submitted to Phys. Rev. B