Novel properties in Josephson junctions involving the cos(kx)cos(ky)-pairing state in iron-pnictides

Details Novel properties in Josephson junctions involving the cos(kx)cos(ky)-pairing state in iron-pnictides Novel properties in Josephson junctions involving the cos(kx)cos(ky)-pairing state in iron-pnictides

2008-12-03

arxiv.org/abs/0812.0661v2

Phys. Rev. B 80, 012511 (2009)

Physics

Condensed Matter

Superconductivity

4+ pages, 4 figures, published version with improved figures and updated references

Scientific paper

We propose a trilayer $\pi$-junction that takes advantage of the unconventional $s_{x^2 y^2}=\cos k_x \cos k_y$ pairing symmetry which changes sign between electron and hole Fermi pockets in the iron pnictides. In addition, we also present theoretical results for Andreev bound states in thin superconductor-normal metal (or insulator) iron-pnictide junctions. The presence of nontrivial in-gap states, which uniquely appear in this unconventional pairing state, is a distinct feature in comparison to other singlet pairing states.

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