Complex state induced by impurities in multiband superconductors
Valentin Stanev, Alexei E. Koshelev
DOI 10.1103/PhysRevB.89.100505 · Physical Review B
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Abstract
We study the role of impurities in a two-band superconductor, and elucidate the nature of the recently predicted transition from the s± state to the s++ state induced by interband impurity scattering. Using a Ginzburg-Landau theory, derived from microscopic equations, we demonstrate that close to Tc this transition is necessarily a direct one, but deeper in the superconducting state an intermediate complex state appears. This state has a distinct order parameter, which breaks the time-reversal symmetry, and is separated from the s± and s++ states by continuous phase transitions. Based on our results, we suggest a phase diagram for systems with weak repulsive interband pairing, and discuss its relevance to iron-based superconductors.
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