Domain walls and their experimental signatures in s+is superconductors.
Arguments were recently advanced that hole-doped Ba(1-x)K(x)Fe2As2 exhibits the s+is state at certain doping. Spontaneous breaking of time-reversal symmetry in the s+is state dictates that it possess domain wall excitations. Here, we discuss what are the experimentally detectable signatures of domain walls in the s+is state. We find that in this state the domain walls can have a dipolelike magnetic signature (in contrast to the uniform magnetic signature of domain walls p+ip superconductors). We propose experiments where quench-induced domain walls can be stabilized by geometric barriers and observed via their magnetic signature or their influence on the magnetization process, thereby providing an experimental tool to confirm the s+is state.
Department of Physics, University of Massachusetts Amherst, Massachusetts 01003, USA and Department of Theoretical Physics, Royal Institute of Technology, Stockholm, SE-10691, Sweden.
Julien
J
Garaud
Department of Physics, University of Massachusetts Amherst, Massachusetts 01003, USA and Department of Theoretical Physics, Royal Institute of Technology, Stockholm, SE-10691, Sweden.
Egor
E
Babaev