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arXiv 0705.1946cond-mat.supr-concond-mat.mes-hall
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具有反铁磁夹层的d波超导结中的新型约瑟夫森效应

Novel Josephson Effects in d-wave Superconductor Junctions with Antiferromagnetic Interlayers

Brian M. Andersen, Yu. S. Barash, S. Graser, P. J. Hirschfeld

摘要:

我们计算了通过约瑟夫森隧道结的直流超导电流,该隧道结由夹在两个d波超导体(d)之间的反铁磁(AF)夹层组成。这样的d/AF/d结表现出丰富的约瑟夫森电流对层间参数的依赖性,包括随着温度或层间厚度的变化而发生0-π跃迁的可能性。此外,我们研究了d/I/d结时,dSC导线包括次优势磁相关。在这种情况下,界面附近的感生磁性可以强烈地减小110取向结的临界电流,而对于100取向没有得到抑制。这可能有助于解决高温超导体中临界电流与晶界角关系的长期难题。

英文摘要:

We calculate the dc supercurrent through a Josephson tunnel junction consisting of an antiferromagnetic (AF) interlayer sandwiched between two d-wave superconductors (d). Such d/AF/d junctions exhibit a rich dependence of the Josephson current on the interlayer parameters, including the possibility of 0-pi transitions with varying temperature or interlayer thickness. Furthermore, we study d/I/d junctions when the dSC leads include subdominant magnetic correlations. In this case induced magnetism near the interface can strongly diminish the critical current for 110 oriented junctions whereas no suppression is obtained for the 100 orientation. This may help resolve a long-standing puzzle of the critical current versus grain boundary angle in high-T_c superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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