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首页> 外文期刊>Physica, C. Superconductivity and its applications >Investigation of vortex dynamics in Josephson junction arrays with magnetic flux noise measurements
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Investigation of vortex dynamics in Josephson junction arrays with magnetic flux noise measurements

机译:用磁通量噪声测量研究约瑟夫森结阵列中的涡旋动力学

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We have measured the magnetic flux noise in a two-dimensional Josephson junction array in nominally zero magnetic field, in the vicinity of the superconducting transition. This transition is of the Berezinski-Kosterlitz-Thouless (BKT) type, driven by the unbinding of thermally excited vortex-antivortex pairs. At temperatures just above the BKT transition temperature T-c, the flux-noise power spectrum S(omega) is white up to a temperature dependent cross-over frequency omega(xi) (T). We identify omega(xi) with the characteristic time related to the scale at which the cross-over from free vortex response to a response dominated by bound pairs occurs. The signature of free vortices is thus white noise while bound vortex pairs give rise to a 1/omega dependence. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 14]
机译:我们已经测量了在超导跃迁附近,名义上为零磁场的二维约瑟夫森结阵列中的磁通量噪声。这种转变是Berezinski-Kosterlitz-Thouless(BKT)类型的,它是由热激发涡旋-反涡旋对的解开驱动的。在刚好高于BKT转变温度T-c的温度下,通量噪声功率谱S(ω)在达到温度相关的交叉频率ω(xi)(T)之前都是白色的。我们用与时间相关的特征时间来确定ω(xi),在该时间尺度上发生从自由涡旋响应到以绑定对为主的响应的交叉。因此,自由涡旋的特征是白噪声,而绑定的涡旋对则产生1 /ω依赖性。 (C)2001 Elsevier Science B.V.保留所有权利。 [参考:14]

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