Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis

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)_2I_3, have d_{xy}+s order parameters.

4 pages, 2 figures

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• Towards the parameterisation of the Hubbard model for salts of BEDT-TTF: A density functional study of isolated molecules
• A phenomenological model of the superconducting state of the Bechgaard salts
• Unconventional superconductivity near a flat band in organic and organometallic materials
• Topological superconductivity from doping a triplet quantum spin liquid in a flat band system
• Nuclear Magnetic Resonance in Low-Symmetry Superconductors
• Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice