Josephson effect due to the long-range odd-frequency triplet superconductivity in SFS junctions with Néel domain walls
Abstract
We consider a SFS Josephson junction made of two superconductors S and a multidomain ferromagnet F with an in-plane magnetization. We assume that the neighboring domains of the ferromagnet are separated by Néel domain walls. An odd-frequency triplet long-range component of superconducting correlations arises in the domain walls and spreads into the domains over a long distance of the order ξT=D/2πT , where D is the diffusion coefficient (dirty limit is implied). We calculate the contribution of this component to the Josephson current in the situation when conventional short-range components exponentially decay over the thickness of the F layer and can be neglected. In the limit when the thickness of the F layer is much smaller than the penetration length of the long-range component, we find that the junction is in the π state. We also analyze a correction to the density of states due to the long-range triplet component.
- Publication:
-
Physical Review B
- Pub Date:
- March 2007
- DOI:
- 10.1103/PhysRevB.75.104509
- arXiv:
- arXiv:cond-mat/0610440
- Bibcode:
- 2007PhRvB..75j4509F
- Keywords:
-
- 74.50.+r;
- 74.45.+c;
- 74.78.Fk;
- 75.70.Kw;
- Tunneling phenomena;
- point contacts weak links Josephson effects;
- Proximity effects;
- Andreev effect;
- SN and SNS junctions;
- Multilayers superlattices heterostructures;
- Domain structure;
- Condensed Matter - Superconductivity;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- 12 pages (including 6 EPS figures)