Scattering theory of the Josephson effect in iron based superconductors

11th European Conference on Applied Superconductivity

Nappi, C.^1,2 ; Nicola, S. De^2 ; Adamo, M.^1,2 ; Sarnelli, E.^1,2

CNR-Istituto di Cibernetica E. Caianiello, Via Campi Flegrei 34, Pozzuoli, Napoli

I80078, Italy^1

CNR-SPIN, Complesso Universitario di M. S. Angelo, Via Cintia, Napoli

I-80126, Italy^2

关键词: High temperature;    Josephson current;    Josephson effect;    Junction interfaces;    Scattering problems;    Scattering theory;    Temperature dependence;    Two-band superconductors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/1/012035/pdf
DOI  :  10.1088/1742-6596/507/1/012035

来源: IOP

【 摘 要 】

We study the Josephson effect in S±IS±junctions made by a two band superconductor with s±wave symmetry. We derive the Andreev coefficients for the scattering problem at the junction interface and the temperature dependence of the critical current. We predict various features of the Josephson current for certain values of the second band strengths and tunnel barrier amplitude among which a high temperature π state coupling, and a π to 0 transition as the temperature lowers.