Organic superconductors: the need to go beyond effective 1/2-filled band models

Abstract

A frustrated, effective 1/2-filled band Hubbard-Heisenberg model has been proposed to describe the strongly dimerized charge-transfer solid families kappa-(ET)_2X and Z[Pd(dmit)_2]_2. In addition to unconventional superconductivity these materials also exhibit antiferromagnetism, candidate spin-liquid phases, and in the case of Z=EtMe_3P, a so-called valence-bond solid phase. We show that neither superconductivity nor the valence-bond solid phase occurs within the Hubbard-Heisenberg model, indicating that the effective 1/2-filled band model is unsuitable for these materials.

5 pages, 5 figures

References in corpus (12)

• Superconductivity in the repulsive Hubbard model: an asymptotically exact weak-coupling solution
• Mott Transition, Antiferromagnetism, and d-wave Superconductivity in Two-Dimensional Organic Conductors
• Gapless quantum spin liquid, stripe and antiferromagnetic phases in frustrated Hubbard models in two dimensions
• Comparison of the phase diagram of the half-filled layered organic superconductors with the phase diagram of the RVB theory of the Hubbard-Heisenberg model
• Exact diagonalization study of Mott transition in the Hubbard model on an anisotropic triangular lattice
• Mott Transition in a Valence Bond Solid Insulator with a Triangular Lattice
• Absence of superconductivity in the half-filled band Hubbard model on the anisotropic triangular lattice
• Spin-liquid versus spiral-order phases in the anisotropic triangular lattice
• Symmetry of the superconducting order parameter in frustrated systems determined by the spatial anisotropy of spin correlations
• Quantum critical transition from charge-ordered to superconducting state in the triangular lattice negative-U extended Hubbard model
• Emergence of superconductivity, valence bond order and Mott insulators in Pd[(dmit)2] based organic salts
• Absence of Translational Symmetry Breaking in Nonmagnetic Insulator Phase on Two-Dimensional Lattice with Geometrical Frustration

Cited by in corpus (10)

• Unusual ordered phases of highly frustrated magnets: a review
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Coulomb enhancement of superconducting pair-pair correlations in a $\frac{3}{4}$-filled model for $\kappa$-(BEDT-TTF)${}_2$X
• The chemical physics of unconventional superconductivity
• Cooperative enhancement of superconducting correlations by electron-electron and electron-phonon interactions in the quarter-filled band
• Sr${}_2$RuO${}_4$, like doped cuprates and barium bismuthate, is a negative charge-transfer gap even parity superconductor with $\frac{3}{4}$-filled oxygen band
• Theory of metal-intercalated phenacenes: Why molecular valence 3 is special
• Theory of triangular lattice quasi-one-dimensional charge-transfer solids
• Absence of superconductivity in the Hubbard dimer model for kappa-(BEDT-TTF)_2X