Abstract
Experimental studies of dynamic magnetic properties of a highly homogeneous sample of ${\mathrm{La}}_{0.95}{\mathrm{Sr}}_{0.05}{\mathrm{CoO}}_{3}$ perovskite evidence the existence of a low-temperature spin-glass phase. A dynamic scaling analysis of ac susceptibility data according to conventional critical slowing down implies a finite spin-glass phase-transition temperature ${T}_{g}\ensuremath{\approx}14.6\mathrm{K}$ and a dynamic exponent $z\ensuremath{\nu}\ensuremath{\approx}10.3.$ Low-field magnetic relaxation experiments show essentially logarithmic magnetic relaxation and aging effects at all temperatures below ${T}_{g}$ and that temperature perturbations affect the relaxation function in a way that is characteristic for a low-temperature spin-glass phase. Finally, it is also shown that ``simple'' remanent magnetization vs temperature curves, measured after specific cooling protocols, can yield information on dynamic properties such as aging and memory phenomena.
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