Time reversal symmetry breakdown in normal and superconducting states in frustrated three-band systems

Abstract

We discuss the phase diagram and phase transitions in $U(1)\times \groupZ{2}$ three-band superconductors with broken time reversal symmetry. We find that beyond mean field approximation and for sufficiently strong frustration of interband interactions there appears an unusual metallic state precursory to a superconducting phase transition. In that state, the system is not superconducting. Nonetheless, it features a spontaneously broken $\groupZ{2}$ time reversal symmetry. By contrast, for weak frustration of interband coupling the energy of a domain wall between different $\groupZ{2}$ states is low and thus fluctuations restore broken time reversal symmetry in the superconducting state at low temperatures.

4 pages, 4 figures (In addition, 2 pages of supplementary material with 2 figures). V2, published version

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