π Junction to Probe Antiphase s-Wave Pairing in Iron Pnictide Superconductors

Wei-Qiang Chen; Fengjie Ma; Zhong-Yi Lu; Fu-Chun Zhang

doi:10.1103/PhysRevLett.103.207001

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π Junction to Probe Antiphase s-Wave Pairing in Iron Pnictide Superconductors

Wei-Qiang Chen, Fengjie Ma, Zhong-Yi Lu, Fu-Chun Zhang

DOI 10.1103/PhysRevLett.103.207001 · Physical Review Letters

T1

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Abstract

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 π phase to probe the antiphase pairing.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NdFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.175	Pressure not reported	unknown