Model prediction of high-temperature pi-states in iron pnictide superconductor-insulator-superconductor Josephson junctions

Year: 2013

Authors: Nappi C., De Nicola S., Adamo M., Sarnelli E.

Autors Affiliation: CNR – Istituto di Cibernetica “E. Caianiello” – Via Campi Flegrei 34, I-80078, Pozzuoli, Napoli, Italy, EU; CNR – Istituto Nazionale di Ottica – Via Campi Flegrei 34, I-80078, Pozzuoli, Napoli, Italy, EU; CNR – SPIN Complesso Universitario di M. S. Angelo – Via Cinthia, I-80126, Napoli, Italy, EU

Abstract: We study the Josephson effect in s(+/-)Is(+/-) junctions made by two-bands reversed-sign s-wave (s(+/-)) superconductive materials. We derive a spectral equation providing the bound Andreev energy states at the interface. The energy spectrum depends on a parameter accounting for the weight of the second band with respect to the first one. For selected values of this parameter and the tunnel barrier amplitude, we predict various features of the Josephson current, among which a possible high-temperature doubly degenerate junction ground state (pi-state) and a pi -> 0 crossover with decreasing temperature. Copyright (C) EPLA, 2013

Journal/Review: EPL

Volume: 102 (4)      Pages from: 47007  to: 47007

More Information: We thank A. A. GOLUBOV for illuminating discussions on this topic. The financial contribution of EU NMP.2011.2.2-6 IRONSEA project No. 283141 is gratefully acknowledged.
DOI: 10.1209/0295-5075/102/47007

Citations: 11
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