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Domain walls and their experimental signatures in s+is superconductors

Abstract

Arguments were recently advanced that hole-doped Ba1βˆ’x_{1-x}Kx_xFe2_2As2_2 exhibits s+iss+is state at certain doping. Spontaneous breaking of time reversal symmetry in s+iss+is state, dictates that it possess domain wall excitations. Here, we discuss what are the experimentally detectable signatures of domain walls in s+iss+is state. We find that in this state the domain walls can have dipole-like magnetic signature (in contrast to the uniform magnetic signature of domain walls p+ipp+ip superconductors). We propose experiments where quench-induced domain walls can be stabilized by geometric barriers and be observed via their magnetic signature or their influence on the magnetization process, thereby providing an experimental tool to confirm s+iss+is state.Comment: Replaced with a version in print in Physical Review Letters; Minor changes; 8 pages, 9 figure

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