Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis
B. J. Powell
Abstract
We present a group theoretic analysis of several classes of organic superconductors. We argue that highly frustrated half-filled layered organic superconductors, such as kappa-(ET)2Cu2(CN)3 (where ET is BEDT-TTF) and beta'-[Pd(dmit)2]2X, undergo two superconducting phase transitions, the first from the normal state to a d-wave superconductor and the second to a d+id state. We show that the monoclinic distortion of kappa-(ET)2Cu(NCS)2 means that the symmetry of its superconducting order parameter is different from that of orthorhombic kappa-(ET)2Cu[N(CN)2]Br. We propose that quarter filled layered organic superconductors, e.g., theta-(ET)2I3, have dxy+s order parameters.
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