Ageing, rejuvenation and memory phenomena in a Bi-2212 superconductor showing the paramagnetic Meissner effect
Ageing, rejuvenation and memory phenomena in a Bi-2212 superconductor showing the paramagnetic Meissner effect
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Bi-2212 超导体中的老化、再生和记忆现象显示出顺磁迈斯纳效应
DOI：
10.1007/pl00011143
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
P. Nordblad
中科院分区：
文献类型：
--
作者：
E. Papadopoulou;P. Nordblad
用磁弛豫和交流磁化率实验研究了具有顺磁迈斯纳效应（PME）和时效现象的熔铸Bi2Sr2CaCu2O8样品。在低频交流磁化率和磁化强度与温度曲线中观察到记忆行为，这些曲线是在某些冷却方案后加热时测得的。还发现，足够大的温度变化和正的温度扰动引起的老化系统的复兴。所有这些观察结果显示出惊人的相似之处与自旋玻璃的老化行为，并表明在此PME材料中存在低温玻璃相。
A melt-cast Bi 2 Sr 2 CaCu 2 O 8 sample showing the paramagnetic Meissner effect (PME) and an ageing phenomenon has been studied by magnetic relaxation and ac-susceptibility experiments. A memory behaviour is observed in the low frequency ac-suscpetibility and in the magnetisation vs. temperature curves measured on heating after certain cooling protocols. It is also found that large enough temperature shifts and positive temperature perturbations cause rejuvenation of the ageing system. All these observations show striking similarities with the ageing behaviour of spin glasses and indicate the existence of a low temperature glassy phase in this PME material.