Effects of order parameter self-consistency in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mo>±</mml:mo></mml:msub><mml:mo>−</mml:mo><mml:mi>s</mml:mi></mml:mrow></mml:math>junction

Abstract

The properties of Josephson tunneling between a single-band $s$-wave superconductor and a two-band ${s}_{\ifmmode\pm\else\textpm\fi{}}$ superconductor are studied, in relation to recent experiments involving iron-based superconductors. We study both a single junction and a loop consisting of two junctions. In both cases, the relative phase between the order parameters of the two superconductors is tuned and the energy of the system is calculated. In a single junction, we find four types of behaviors characterized by the location of minima in the energy/phase relations. These phases include a newly found double minimum junction, which appears only when the order parameters are treated self-consistently. We analyze the loop geometry setup in light of our results for a single junction, where the phase difference in the junctions is controlled by a threaded flux. We find four types of energy/flux relations. These include states for which the energy is minimized when the threaded flux is an integer or half-integer number of flux quanta, a time reversal broken state and a metastable state.

Locations

• Physical review. B./Physical review. B - View
• arXiv (Cornell University) - View - PDF
• DataCite API - View