Viscous behavior in a quasi-1D fractal cluster glass.
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.
Etzkorn
S J
SJ
Department of Physics, The Ohio State University, Columbus, OH 43210-1106, USA.
Hibbs
Wendy
W
Miller
Joel S
JS
Epstein
A J
AJ