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

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

2007-05-14

arxiv.org/abs/0705.1946v2

Phys. Rev. B 77, 054501 (2008)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.054501

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.

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