Antiferromagnetism and Superconductivity in layered organic conductors: Variational cluster approach

Abstract

The $\kappa$-(ET)${}_2$X layered conductors (where ET stands for BEDT-TTF) are studied within the dimer model as a function of the diagonal hopping $t^{\prime }$ and Hubbard repulsion $U$. Antiferromagnetism and d-wave superconductivity are investigated at zero temperature using variational cluster perturbation theory (V-CPT). For large $U$, Néel antiferromagnetism exists for $t^{\prime }<t_{c2}^{\prime }$, with $t_{c2}^{\prime }\sim 0.9$. For fixed $t^{\prime }$, as $U$ is decreased (or pressure increased), a $d_{x^2-y^2}$ superconducting phase appears. When $U$ is decreased further, the a $d_{xy}$ order takes over. There is a critical value of $t_{c1}^{\prime }\sim 0.8$ of $t^{\prime }$ beyond which the AF and dSC phases are separated by Mott disordered phase.

4 pages, 4 figures. Investigation of the d_xy phase added + discussion of gap symmetry

References in corpus (8)

• Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in κ-(ET)_2 Cu_2 (CN)_3
• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)2Cu2(CN)3
• Competition between Antiferromagnetism and Superconductivity in High $T_c$ Cuprates
• Variational cluster approach to spontaneous symmetry breaking: The itinerant antiferromagnet 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
• Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts
• Gossamer Superconductivity near Antiferromagnetic Mott Insulator in Layered Organic Conductors

Cited by in corpus (46)

• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• Correlation-driven chiral superconductivity and chiral spin order in doped kagome lattice
• Chiral d-wave superconductivity in doped graphene
• Anomalous superconductivity and its competition with antiferromagnetism in doped Mott insulators
• The Hubbard model on the triangular lattice: Spiral order and spin liquid
• Apical oxygens and correlation strength in electron and hole doped copper oxides
• The Paired Electron Crystal: order from frustration in the quarter-filled band
• Phase diagram of the Hubbard model on the anisotropic triangular lattice
• Absence of superconductivity in the half-filled band Hubbard model on the anisotropic triangular lattice
• Magnetism and d-wave superconductivity on the half-filled square lattice with frustration
• Phase diagram of the anisotropic triangular lattice Hubbard model
• Electron-hole doping asymmetry of Fermi surface reconstructed in a simple Mott insulator
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Magnetic properties and Mott transition in the Hubbard model on the anisotropic triangular lattice
• Mott transition in two-dimensional frustrated compounds
• Towards the parameterisation of the Hubbard model for salts of BEDT-TTF: A density functional study of isolated molecules
• Mott transition and magnetism of the triangular-lattice Hubbard model with next-nearest-neighbor hopping
• Pseudogap and singlet formation in cuprate and organic superconductors
• Augmented hybrid exact-diagonalization solver for dynamical mean field theory
• Spin liquid phase in the semiclassical theory of the Heisenberg model on an anisotropic triangular lattice with ring exchange
• Spin liquid phase due to competing classical orders in the semiclassical theory of the Heisenberg model with ring exchange on an anisotropic triangular lattice
• Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device
• Absence of long-range superconducting correlations in the frustrated 1/2-filled band Hubbard model
• Mechanism of superconductivity and electron-hole doping asymmetry in $\kappa$-type molecular conductors
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides
• Mott transition, Widom line and pseudogap in the half-filled triangular lattice Hubbard model
• Magnetic properties and Mott transition in the square-lattice Hubbard model with frustration
• Incommensurate spiral magnetic order on anisotropic triangular lattice: Dynamical mean field study in a spin-rotating frame
• Coulomb enhancement of superconducting pair-pair correlations in a $\frac{3}{4}$-filled model for $\kappa$-(BEDT-TTF)${}_2$X
• Variational cluster approach to s-wave pairing in heavy-fermion superconductors
• Mixed pairing symmetry in κ-(BEDT-TTF)_2 X organic superconductors from ultrasonic velocity measurements
• Role of Frustration and Dimensionality in the Hubbard Model on the Stacked Square Lattice: Variational Cluster Approach
• Mott transition and magnetism on the anisotropic triangular lattice
• Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Hubbard Model
• Magnetic phases of the anisotropic triangular lattice Hubbard model
• Quarter-filled Kitaev-Hubbard Model: A Quantum Hall State in an Optical Lattice
• Excitonic Order and Superconductivity in the Two-Orbital Hubbard Model: Variational Cluster Approach
• Phase Diagram of the Frustrated Square-Lattice Hubbard Model: Variational Cluster Approach
• Magnetic phase diagram and Mott transition of the half-filled 1/5-depleted Hubbard model with frustration
• Theory of triangular lattice quasi-one-dimensional charge-transfer solids
• Destabilization of ferromagnetism by frustration and realization of a nonmagnetic Mott transition in the quarter-filled two-orbital Hubbard model
• Character of frustration on magnetic correlation in doped Hubbard model
• Zero-temperature Phase Diagram of Two Dimensional Hubbard Model
• Absence of superconductivity in the Hubbard dimer model for kappa-(BEDT-TTF)_2X
• $d$-wave Superconductivity in the Hubbard model on the isotropic triangular lattice and a possibility of the chiral $d+id$ pairing as a quasi-stable state
• Scan calculation of the density of states: real space cluster perturbation theory applied to inhomogeneous Hubbard model in one dimension