首页> 外文期刊>The European physical journal, B. Condensed matter physics >Ageing, rejuvenation and memory phenomena in a Bi-2212 superconductor showing the paramagnetic Meissner effect
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Ageing, rejuvenation and memory phenomena in a Bi-2212 superconductor showing the paramagnetic Meissner effect

机译:Bi-2212超导体中的老化,振兴和记忆现象,表现出顺磁迈斯纳效应

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摘要

A melt-cast Bi_2Sr_2CaCu_2O_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.
机译:通过磁弛豫和磁化率实验研究了具有顺磁性迈斯纳效应(PME)和老化现象的Bi_2Sr_2CaCu_2O_8熔铸样品。在低频冷却性和某些冷却方案下加热后测得的磁化-温度曲线中观察到记忆行为。还发现足够大的温度变化和正温度扰动会导致老化系统恢复活力。所有这些观察结果均显示出与自旋玻璃的老化行为具有惊人的相似性,并表明该PME材料中存在低温玻璃态相。

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