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Width of the 0-pi phase transition in diffusive magnetic Josephson junctions

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2008

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Zareyan, Malek

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http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-121097
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https://doi.org/10.1103/PhysRevB.78.214518
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Physical Review B. 2008, 78, 214518. Available under: doi: 10.1103/PhysRevB.78.214518

Zusammenfassung

We investigate the Josephson current between two superconductors (S) which are connected through a diffusive magnetic junction with a complex structure (F-c). Using the quantum circuit theory, we obtain the phase diagram of 0 and pi Josephson couplings for F-c being an insulator-ferromagnet-insulator (IFI) double barrier junction or an IFNFI structure (where N indicates a normal-metal layer). Compared to a simple SFS structure, we find that the width of the transition, defined by the interval of exchange fields in which a 0-pi transition is possible, is increased by insulating barriers at the interfaces and also by the presence of the additional N layer. The widest transition is found for symmetric F-c structures. The symmetric SIFNFIS presents the most favorable condition to detect the temperature-induced 0-pi transition with a relative width, which is five times larger than that of the corresponding simple SFS structure.

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530 Physik

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Josephson effect, phase diagrams, superconducting transitions

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ISO 690SHOMALI, Zahra, Malek ZAREYAN, Wolfgang BELZIG, 2008. Width of the 0-pi phase transition in diffusive magnetic Josephson junctions. In: Physical Review B. 2008, 78, 214518. Available under: doi: 10.1103/PhysRevB.78.214518
BibTex
@article{Shomali2008Width-1003,
  year={2008},
  doi={10.1103/PhysRevB.78.214518},
  title={Width of the 0-pi phase transition in diffusive magnetic Josephson junctions},
  volume={78},
  journal={Physical Review B},
  author={Shomali, Zahra and Zareyan, Malek and Belzig, Wolfgang},
  note={Article Number: 214518}
}
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