二级CoCl $_{2}$石墨层间化合物分级递变的时效浸渍和累积时效
Aging dip and cumulative aging in hierarchical successive transition of stage-2 CoCl$_{2}$ graphite intercalation compound
摘要：
用低频（$f$ = 0.1 Hz）交流磁化率（$χ^{\prime}$和$χ^{\prime\prime}$）和热剩磁研究了第2阶段CoCl $_{2}$ GIC（$T_{cu}$ = 8.9 K和$T_{cl}$ = 6.9 K）的记忆和老化行为。发生了从累积老化（主要）到在$T_{cu}$和$T_{cl}$之间的中间状态中的畴生长的部分记忆效应到在低于$T_{cl}$的自旋玻璃相中的老化和记忆的交叉。当系统在单个或多个停止和等待过程中老化，停止温度$T_{s}$低于$T_{cl}$，等待时间$t_{s}$时，交流磁化率在重新加热时显示$T_{s}$的单个或多个老化下降。老化下降的深度与等待时间$t_{s}$成比例。在$T_{cu}$和$T_{cl}$之间非常弱的老化下降表明存在部分记忆效应。在从高$T$侧穿过$T_{cl}$时，参考冷却曲线和参考加热曲线之间的差值的符号从正变为负。$χ^{\prime}$和低于$T_{cl}$的$χ^{\prime\prime}$的时间依赖性由$ωt$的缩放函数描述。在6.5 K时，在低于$T_{cl}$的温度下，有一个局部极大值，并随着$T$的增加而急剧减小。还检查了$T_{cl}$和$T_{cu}$之间累积老化的性质。
英文摘要：
Memory and aging behaviors in stage-2 CoCl$_{2}$ GIC ($T_{cu}$ = 8.9 K and $T_{cl}$ = 6.9 K) have been studied using low frequency ($f$ = 0.1 Hz) AC magnetic susceptibility ($χ^{\prime}$ and $χ^{\prime\prime}$) as well as thermoremnant magnetization. There occurs a crossover from a cumulative aging (mainly) with a partial memory effect for the domain-growth in the intermediate state between $T_{cu}$ and $T_{cl}$ to an aging and memory in a spin glass phase below $T_{cl}$. When the system is aged at single or multiple stop and wait processes at stop temperatures $T_{s}$'s below $T_{cl}$ for wait times $t_{s}$, the AC magnetic susceptibility shows single or multiple aging dips at $T_{s}$'s on reheating. The depth of the aging dips is logarithmically proportional to the wait time $t_{s}$. Very weak aging dip between $T_{cu}$ and $T_{cl}$ indicates the existence of a partial memory effect. The sign of the difference between the reference cooling and reference heating curves changes from positive to negative on crossing $T_{cl}$ from the high $T$-side. The time dependence of $χ^{\prime}$ and $χ^{\prime\prime}$ below $T_{cl}$ is described by a scaling function of $ωt$. its a local maximum at 6.5 K just below $T_{cl}$, and drastically decreases with increasing $T$. The nature of the cumulative aging between $T_{cl}$ and $T_{cu}$ is also examined.
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