Volume 102, Number 4, May 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 June 2013|
Model prediction of high-temperature π-states in iron pnictide superconductor-insulator-superconductor Josephson junctions
1 CNR - Istituto di Cibernetica “E. Caianiello” - Via Campi Flegrei 34, I-80078, Pozzuoli, Napoli, Italy, EU
2 CNR - Istituto Nazionale di Ottica - Via Campi Flegrei 34, I-80078, Pozzuoli, Napoli, Italy, EU
3 CNR - SPIN Complesso Universitario di M. S. Angelo - Via Cinthia, I-80126, Napoli, Italy, EU
Received: 14 April 2013
Accepted: 16 May 2013
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 (π-state) and a crossover with decreasing temperature.
PACS: 74.50.+r – Tunneling phenomena; Josephson effects / 74.20.Rp – Pairing symmetries (other than s-wave) / 74.81.-g – Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities
© EPLA, 2013
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