2002/09/25 by C. A. Cardoso, F. M. Araujo-Moreira, F. M. Araújo-Moreira +8 · 3 citations
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Cusp (singularity) #Geometry #Magnetic field #Magnetic susceptibility #Magnetization #Materials science #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Relaxation (psychology) #Spin (aerodynamics) #Spin glass #Spins #Superconductivity #Theoretical and Computational Physics #Thermodynamics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.67.020407
4 pages, 6 figures, submitted to Phys. Rev. B
arxiv created 2002/09/25 · openalex publication_date 2003/01/29 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The dynamics of the magnetic properties of polycrystalline RuSr2Gd1.5Ce0.5Cu2O_10\ensuremath-\ensuremathδ (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\ensuremath-O2 planes below Tc\ensuremath∼40K. 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 \ensuremathχac 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=60K. TRM relaxations are well described by a stretched exponential relation, and present significant aging effects.