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arXiv 0904.2114cond-mat.supr-con
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邻近效应约瑟夫森结阵列的磁屏蔽

Magnetic screening in proximity effect Josephson-junction arrays

Mauro Tesei, Ricardo Theron

摘要:

在邻近效应约瑟夫森结阵列(JJAs)上测量的薄层电感的磁场调制随着温度的降低逐渐消失,导致低温场无关响应。这种行为与晶格参数以下的二维穿透长度的减小是一致的。低温数据进行定量比较与理论预测的基础上的XY模型在没有热波动。结果表明,XY模型对JJA的描述是不完整的,系统被置于远超过弱屏蔽极限的位置,而弱屏蔽极限通常是为了调用描述经典约瑟夫森结阵列的阻挫XY模型而假设的。

英文摘要:

The modulation with magnetic field of the sheet inductance measured on proximity effect Josephson-junction arrays (JJAs) is progressively vanishing on lowering the temperature, leading to a low temperature field-independent response. This behaviour is consistent with the decrease of the two-dimensional penetration length below the lattice parameter. Low temperature data are quantitatively compared with theoretical predictions based on the XY model in absence of thermal fluctuations. The results show that the description of a JJA within the XY model is incomplete and the system is put well beyond the weak screening limit which is usually assumed in order to invoke the well known frustrated XY model describing classical Josephson-junction arrays.

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