Pi junction to probe antiphase s-wave pairing in iron pnictide superconductors.
Josephson junctions between a FeAs-based superconductor with antiphase s-wave pairing and a conventional s-wave superconductor are studied. The translational invariance in a planar junction between a single crystal pnictide and an aluminum metal greatly enhances the relative weight of electron pockets in the pnictide to the critical current. In a wide doping region of the pnictide, a planar and a point contact junction have opposite phases, which can be used to design a trijunction ring with pi phase to probe the antiphase pairing.
Chen
Wei-Qiang
WQ
Department of Physics, and Center of Theoretical and Computational Physics, the University of Hong Kong, Hong Kong, China.
Ma
Fengjie
F
Lu
Zhong-Yi
ZY
Zhang
Fu-Chun
FC