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arXiv 1002.0612cond-mat.dis-nn
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自旋玻璃中的记忆和再生

Memory and rejuvenation in a spin glass

R. Mathieu, M. Hudl, P. Nordblad

摘要:

用弱探测磁场($H$ = 0.5或0 Oe)和特定的热协议研究了Cu(Mn)自旋玻璃($T_g$ $\approx$ 57 K)的磁化强度与温度的关系。零场冷却,thermoregeneration和等温reheoregeneration磁化(再)冷却系统从温度(40 K),系统已被老化的行为进行了研究。据观察,所测量的磁化强度是由两个部分形成:(i)温度和观察时间依赖性的热激活弛豫部分受年龄和温度依赖性的响应函数和(最新的)在较低温度下的磁场变化,叠加在(ii)弱温度依赖性的冻结部分。有趣的是,我们观察到的自旋配置,这是在冷却中的一个细长的停顿期间,如果它是伴随着场致磁化,还包括一个单向的过剩磁化,恢复到老化温度。

英文摘要:

The temperature dependence of the magnetisation of a Cu(Mn) spin glass ($T_g$ $\approx$ 57 K) has been investigated using weak probing magnetic fields ($H$ = 0.5 or 0 Oe) and specific thermal protocols. The behaviour of the zero-field cooled, thermoremanent and isothermal remanent magnetisation on (re-)cooling the system from a temperature (40 K) where the system has been aged is investigated. It is observed that the measured magnetisation is formed by two parts: (i) a temperature- and observation time-dependent thermally activated relaxational part governed by the age- and temperature-dependent response function and the (latest) field change made at a lower temperature, superposed on (ii) a weakly temperature-dependent frozen-in part. Interestingly we observe that the spin configuration that is imprinted during an elongated halt in the cooling, if it is accompanied by a field induced magnetisation, also includes a unidirectional excess magnetisation that is recovered on returning to the ageing temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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