Shot noise as a probe for the pairing symmetry of iron pnictide superconductors

Junction to Probe Antiphase s-Wave Pairing in Iron Pnictide Superconductors

Pi junction to probe antiphase s-wave pairing in iron pnictide superconductors.

Josephson junctions between a FeAs-based superconductor with antiphase s-wave pairing and a conventional s-wave superconductor are studied. The translational invariance in a planar junction between a single crystal pnictide and an aluminum metal greatly enhances the relative weight of electron pockets in the pnictide to the critical current. In a wide doping region of the pnictide, a planar and...

Pairing Symmetry and Multiple Energy Gaps in Multi-Orbital Iron-Pnictide Superconductors

Magnetism, superconductivity, and pairing symmetry in iron-based superconductors

A. V. Chubukov,1 D. V. Efremov,2 and I. Eremin3,4 1Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA 2Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany 3Max-Planck Institut für Physik komplexer Systeme, D-01187 Dresden, Germany 4Institute für Mathematische und Theoretische Physik, TU Braunschweig, D-38106 Braunschweig, G...

Advantageous grain boundaries in iron pnictide superconductors

High critical temperature superconductors have zero power consumption and could be used to produce ideal electric power lines. The principal obstacle in fabricating superconducting wires and tapes is grain boundaries-the misalignment of crystalline orientations at grain boundaries, which is unavoidable for polycrystals, largely deteriorates critical current density. Here we report that high cri...