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首页> 外文期刊>Physica, C. Superconductivity and its applications >Energy scales in YBaCuO grain boundary biepitaxial Josephson junctions
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Energy scales in YBaCuO grain boundary biepitaxial Josephson junctions

机译：YBaCuO晶界双轴约瑟夫森结的能级

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摘要

Self-assembled nanoscale channels may naturally arise in the growth process of grain boundaries (GBs) in high critical temperature superconductor (HTS) systems, and deeply influence the transport properties of the GB Josephson junctions (JJs). By isolating nano-channels in YBCO biepitaxial JJs and studying their properties, we sort out specific fingerprints of the mesoscopic nature of the contacts. The size of the channels combined to the characteristic properties of HTS favors a special regime of the proximity effect, where normal state coherence prevails on the superconducting coherence in the barrier region. Resistance oscillations from the current-voltage characteristic encode mesoscopic information on the junction and more specifically on the minigap induced in the barrier. Thouless energy emerges as a characteristic energy of these types of Josephson junctions. Possible implications on the understanding of coherent transport of quasiparticles in HTS and of the dissipation mechanisms are discussed, along with elements to take into account when designing HTS nanostructures.
机译：自组装的纳米级通道自然可能会在高临界温度超导体（HTS）系统的晶界（GB）的生长过程中产生，并深刻影响GB约瑟夫森结（JJs）的传输性质。通过隔离YBCO双轴JJ中的纳米通道并研究其特性，我们筛选出了触头介观性质的特定指纹。与HTS的特性相结合的通道大小有利于特殊的邻近效应，在势垒区的超导相干中，态相干性占主导地位。来自电流-电压特性的电阻振荡会编码结点上的介观信息，更具体而言，会记录势垒中感应的最小间隙。几乎没有能量作为这些类型的约瑟夫森结的特征能量出现。讨论了对理解HTS中准粒子的相干传输和耗散机制的可能含义，以及设计HTS纳米结构时要考虑的要素。

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