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Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing

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arxiv 1009.4756 v1 pith:HZLM5SQN submitted 2010-09-24 cond-mat.supr-con

Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing

Wei-Qiang Chen , Fu-Chun Zhang This is my paper
classification cond-mat.supr-con
keywords fe-pnictidespi-phaseshiftinterfacejunctionpairingpossibles-wave
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We examine the nature of Josephson junction between two identical Fe-pnictides with anti-phase s-wave pairing. pi-phase shift is found if the junction barrier is thick and the two Fe-pnictides are oriented in certain directions relative to the interface. Our theory provides a possible explanation for the observed half integer flux quantum transitions in a niobium/polycrystal NdFeAsO loop, and attributes the pi-phase shift to intergrain junctions of Fe-pnictides.

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