Josephson effect due to the longrange oddfrequency 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 inplane magnetization. We assume that the neighboring domains of the ferromagnet are separated by Néel domain walls. An oddfrequency triplet longrange component of superconducting correlations arises in the domain walls and spreads into the domains over a long distance of the order ξ_{T}=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 shortrange 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 longrange component, we find that the junction is in the π state. We also analyze a correction to the density of states due to the longrange triplet component.
 Publication:

Physical Review B
 Pub Date:
 March 2007
 DOI:
 10.1103/PhysRevB.75.104509
 arXiv:
 arXiv:condmat/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
 EPrint:
 12 pages (including 6 EPS figures)