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.

arXiv comment4 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
• In-plane superfluid density and microwave conductivity of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br: evidence for d-wave pairing and resilient quasiparticles
• Spin Fluctuations and the Pseudogap in Organic Superconductors
• Dynamical reduction of the dimensionality of exchange interactions and the "spin-liquid" phase of $\kappa$-(BEDT-TTF)${}_{2}X$
• Electronic Structure Calculation and Superconductivity in $\lambda$-(BETS)${}_2$GaCl${}_4$
• 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
• Fate of the Hebel-Slichter peak in superconductors with strong antiferromagnetic fluctuations
• Microwave Conductivity Distinguishes Between Different d-wave States: Umklapp Scattering in Unconventional Superconductors
• Nuclear Magnetic Resonance in Low-Symmetry Superconductors
• Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice