A diagrammatic approach to triplet supercurrents in ferromagnetic Josephson junctions

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• 作者：Ioannis Margaris ; Vassilis Paltoglou…
• 关键词：Mesoscopic and Nanoscale Systems
• 刊名：The European Physical Journal B - Condensed Matter
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：88
• 期：6
• 全文大小：645 KB
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• 作者单位：Ioannis Margaris (1)
  Vassilis Paltoglou (2)
  Matthew Alexandrakis (1)
  Nikolaos Flytzanis (1)
  
  1. Department of Physics, University of Crete, P.O. Box 2208, 71003, Heraklion, Crete, Greece
  2. Department of Applied Mathematics, University of Crete, P.O. Box 2208, 71409, Heraklion, Crete, Greece
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Physics
  Complexity
  Fluids
  Solid State Physics and Spectroscopy
  Superconductivity, Superfluidity and Quantum Fluids
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6036

文摘

We present a numerical study of ferromagnetic Josephson junctions with one intermediate layer and spin active interfaces in the ballistic regime, comparing the behaviour of one, two and three dimensional junctions. We find that in two and three dimensional junctions the geometries which lack spin flip scattering at one of the interfaces have a critical current that decays to zero, as we increase the magnetization of the intermediate layer towards the half metal limit. As known, magnetization direction inhomogeneity produces a long range supercurrent with width variation, even when spin flip scattering exists in one of the interfaces only, although of lower characteristic decay length, compared to junctions with spin flip scattering at both interfaces. In the case of a single spin-flip interface and large thickness of the junction, we find a dominant second harmonic in the current-phase relation, in agreement with earlier work. We apply a diagrammatic approach, which explains the strong second harmonic and the long range property of the supercurrent. We find that in the three dimensional junction case the main contribution to both the long range supercurrent and the second harmonic in thick Josephson junctions with one spin flip interface comes from diagrammatic terms that correspond to scattering loops inside the junction which are subject to anomalous Andreev reflections on the spin flip interface and normal Andreev reflections at the non spin flip interface, thus exhibiting the triplet nature of the phenomenon. We also find the emergence of the strong first harmonic for small variation of the magnetization geometry and comment on the effect of normal interface scattering and temperature on the second harmonic.