Proximity and Josephson effects in microstructures based on multiband superconductors
Proximity and Josephson effects in microstructures based on multiband superconductors
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发表时间：
2017
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通讯作者：
Y. Yerina
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作者：
Y. Yerina
多能带超导性出现于20世纪50年代，长期以来一直被认为是一种近似模型，其形式是将BCS理论推广到两个能带的情况，以便更准确地定量描述铜酸盐、重费米子化合物、金属碳化硼、富勒烯、钌酸锶等超导体的性质和特征，因为它们具有复杂的分段连续费米表面。然而，2001 年二硼化镁和 2008 年铁氮氧化物和卤化物中超导态多能带结构的发现导致了许多论文的出现，其中重新审视了常见单带 s 波超导体众所周知的效应和不同依赖性。这些研究的主要目的是揭示有序参数的对称类型，这提供了有关这些超导体中库珀配对机制的重要信息。获得多带超导体有序参数对称性信息的最有效方法之一是相敏技术。本综述总结了基于多带超导体与普通金属、绝缘体和其他超导体接触的系统中的邻近效应和约瑟夫森效应的理论和实验研究结果。由 AIP 出版社出版。 https://doi.org/10.1063/1.5004444
Emerging in the 1950s, the multiband superconductivity has been considered for a long time as an approximate model in the form of a generalization of the BCS theory to the case of two bands for a more accurate quantitative description of the properties and characteristics of such superconductors as cuprates, heavy fermions compounds, metal boron carbides, fullerides, strontium ruthenate etc. due to their complex piecewise-continuous Fermi surfaces. However the discovery of the multiband structure of the superconducting state in magnesium diboride in 2001 and iron oxypnictides and halides in 2008 led to the appearance of many papers in which effects and different dependences well known for usual one-band s-wave superconductors were re-examined. The main purpose of these studies was to reveal the symmetry type of the order parameter, which provides an important information about the mechanism of Cooper pairing in these superconductors. One of the most effective methods of obtaining information on the symmetry properties of the order parameter in the multiband superconductors is phase-sensitive techniques. This review summarizes the results of theoretical and experimental studies of the proximity and Josephson effects in systems based on multiband superconductors in contact with normal metals, insulators and other superconductors. Published by AIP Publishing. https://doi.org/10.1063/1.5004444