Magnetic Aging in Bi 2 Sr 2 CaCu 2 O 8 Displaying the Paramagnetic Meissner Effect
Magnetic Aging in Bi 2 Sr 2 CaCu 2 O 8 Displaying the Paramagnetic Meissner Effect
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Bi 2 Sr 2 CaCu 2 O 8 中的磁老化表现出顺磁迈斯纳效应
DOI：
10.1103/physrevlett.82.173
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发表时间：
1999
影响因子：
8.6
通讯作者：
R. Gross
中科院分区：
文献类型：
--
作者：
E. Papadopoulou;P. Nordblad;P. Svedlindh;R. Schoneberger;R. Gross
对bi2sr2cacu2o8熔铸样品进行了磁弛豫测量，显示出顺磁迈斯纳效应（PME），表明超导系统中的外场磁时效为零。老化效应是一种协同现象，指出PME样品中存在的自发轨道电流具有集体行为。结果可以通过将超导晶粒的多畴微观结构建模为具有随机分布π结的Josephson结网络来理解。
Magnetic relaxation measurements have been performed on a bulk, melt-cast sample of Bi 2 Sr 2 CaCu 2 O 8, displaying the paramagnetic Meissner effect (PME), revealing zero external field magnetic aging in a superconducting system. The aging effect, being a cooperative phenomenon, points out that the spontaneous orbital currents existing in PME samples behave collectively. The results can be understood by modeling of the polydomain microstructure of the superconducting grains as Josephson junction networks with randomly distributed π junctions.