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首页> 外文期刊>Physica, C. Superconductivity and its applications >Collective dynamics of Josephson fluxons in Bi2Sr2CaCu2O8+delta intrinsic junctions
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Collective dynamics of Josephson fluxons in Bi2Sr2CaCu2O8+delta intrinsic junctions

机译：Bi2Sr2CaCu2O8 +δ本征结中约瑟夫森通量的集体动力学

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摘要

The dynamic characteristics of Josephson fluxons in naturally stacked intrinsic Josephson junctions in Bi2Sr2CaCu2O8+delta single crystals were studied experimentally. The Josephson fluxons were generated either by irradiating microwaves or by applying dc magnetic fields in parallel with the junction planes. In the presence of a finite tunneling bias current the fluxons are driven along the junctions in resonance with the excitation modes of Josephson plasma and thus exhibit a variety of dynamic characteristics. Thus in the flux-flow state of fluxons in both cases above, for a relatively low vortex density, sub-branch splitting of the 'supercurrent' branch in the current-voltage (I-V) characteristics was observed, which corresponded to different plasma excitation modes. For a higher vortex density, on the other hand, all the quasiparticle branches merged into a single non-hysteretic I-V curve which exhibited step-like kink features, very similar to the recently predicted ones corresponding to different moving fluxon patterns. The detailed agreement with the theoretical prediction, however, is yet to be confirmed. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 32]
机译：实验研究了Bi2Sr2CaCu2O8 +δ单晶中自然堆积的本征约瑟夫森结中约瑟夫森通量的动力学特性。约瑟夫森通量是通过辐射微波或通过平行于结平面施加直流磁场而产生的。在存在有限的隧穿偏置电流的情况下，与约瑟夫森等离子体的激发模式共振地沿连接处驱动磁通，从而表现出各种动态特性。因此，在上述两种情况的通量的通量状态下，对于较低的涡旋密度，观察到“超电流”分支在电流-电压（IV）特性中的分支分支，这对应于不同的等离子体激发模式。另一方面，对于更高的涡旋密度，所有准粒子分支合并为一条非阶梯式I-V曲线，该曲线呈现出阶梯状扭结特征，这与最近预测的对应于不同移动磁通模式的弯曲特征非常相似。然而，与理论预测的详细一致性尚待确认。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：32]

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