Aging dynamics in reentrant ferromagnet: Cu${}_{0.2}$Co${}_{0.8}$Cl${}_2$-FeCl${}_3$ graphite bi-intercalation compound

Abstract

Aging dynamics of a reentrant ferromagnet Cu${}_{0.2}$Co${}_{0.8}$Cl${}_2$-FeCl${}_3$ graphite bi-intercalation compound has been studied using AC and DC magnetic susceptibility. This compound undergoes successive transitions at the transition temperatures $T_c$ ($=9.7$ K) and $T_{RSG}$ ($=3.5$ K). The relaxation rate $S(t)$ exhibits a characteristic peak at $t_{cr}$ close to a wait time $t_w$ below $T_c$, indicating that the aging phenomena occur in both the reentrant spin glass (RSG) phase below $T_{RSG}$ and the ferromagnetic (FM) phase between $T_{RSG}$ and $T_c$. The relaxation rate $S(t)$ ($=\text{d}{\chi }_{ZFC}(t)/\text{d}\ln t$) in the FM phase exhibits two peaks around $t_w$ and a time much shorter than $t_w$ under the positive $T$-shift aging, indicating a partial rejuvenation of domains. The aging state in the FM phase is fragile against a weak magnetic-field perturbation. The time ($t$) dependence of ${\chi }_{ZFC}(t)$ around $t\approx t_{cr}$ is well approximated by a stretched exponential relaxation: ${\chi }_{ZFC}(t)\approx \exp [-(t/\tau {)}^{1-n}]$. The exponent $n$ depends on $t_w$, $T$, and $H$. The relaxation time $\tau$ ($\approx t_{cr}$) exhibits a local maximum around 5 K, reflecting a chaotic nature of the FM phase. It drastically increases with decreasing temperature below $T_{RSG}$.

arXiv comment16 pages,16 figures, submitted to Physical Review B

References in corpus (14)

• Geometrical Aspects of Aging and Rejuvenation in the Ising Spin Glass: A Numerical Study
• Aging phenomena in spin glass and ferromagnetic phases: domain growth and wall dynamics
• Numerical Study on Aging Dynamics in the 3D Ising Spin-Glass Model. I. Energy Relaxation and Domain Coarsening
• Symmetrical Temperature-Chaos Effect with Positive and Negative Temperature Shifts in a Spin Glass
• Numerical Study on Aging Dynamics in the 3D Ising Spin-Glass Model. II. Quasi-Equilibrium Regime of Spin Auto-Correlation Function
• A Role of Initial Conditions in Spin-Glass Aging Experiments
• Aging of the Zero-Field-Cooled Magnetization in Ising Spin Glasses: Experiment and Numerical Simulation
• Aging, rejuvenation and memory effects in re-entrant ferromagnets
• Aging effects and dynamic scaling in the 3d Edwards-Anderson spin glasses: a comparison with experiments
• Sensitivity to temperature perturbations of the ageing states in a re-entrant ferromagnet
• Reply to the Comment on `Symmetrical Temperature-Chaos effect with Positive and Negative Temperature Shifts in a Spin Glass'
• Aging phenomena in spin glasses: theory, experiment, and simulation
• Aging, rejuvenation, and memory effects in short-range Ising spin glass: Cu${}_{0.5}$Co${}_{0.5}$Cl${}_2$-FeCl${}_3$ graphite bi-intercalation compound
• Nonlinear magnetic susceptibility and aging phenomena in reentrant ferromagnet: Cu${}_{0.2}$Co${}_{0.8}$Cl${}_2$-FeCl${}_3$ graphite bi-intercalation compound

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