Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis
Powell, B. J.
Original · EN
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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