title: Viscous behavior in a quasi-1D fractal cluster glass.
abstract: The spin glass transition of a quasi-1D organic-based magnet ([MnTPP][TCNE]) is explored using both ac and dc measurements. A scaling analysis of the ac susceptibility shows a spin glass transition near 4 K, with a viscous decay of the thermoremanent magnetization recorded above 4 K. We propose an extension to a fractal cluster model of spin glasses that determines the dimension of the spin clusters (D) ranging from approximately 0.8 to over 1.5 as the glass transition is approached. Long-range dipolar interactions are suggested as the origin of this low value for the apparent lower critical dimension.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, OH 43210-1106, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Etzkorn
authors.forename: Wendy
authors.initials: W
authors.lastname: Hibbs
authors.forename: Joel S
authors.initials: JS
authors.lastname: Miller
authors.forename: A J
authors.initials: AJ
authors.lastname: Epstein