Spin Fluctuation-Induced Superconductivity in Organic Compounds

Abstract

Spin fluctuation-induced superconductivity in two-dimensional organic compounds such as κ-(ET)_2-X is investigated by using a simplified dimer Hubbard model with right-angled isosceles triangular lattice (transfer matrices -τ, -τ^\prime). The dynamical susceptiblity and the self-energy are calculated self-consistently within the fluctuation exchange approximation and the value for T_c as obtained by solving the linearized Eliashberg-type equations is in good agreement with experiment. The pairing symmetry is of d_{x^2-y^2} type. The calculated (U/τ)-dependence of T_c compares qualitatively well with the observed pressure dependence of T_c. Varying the value for τ^\prime/τfrom 0 to 1 we interpolate between the square lattice and the regular triangular lattice and find firstly that values of T_c for κ-(ET)_2-X and cuprates scale well and secondly that T_c tends to decrease with increasing τ^\prime/τand no superconductivity is found for τ^\prime/τ=1, the regular triangular lattice.

4 pages, 6 eps figures, uses jpsj.sty

Cited by in corpus (79)

• Magnetic Penetration Depth in Unconventional Superconductors
• Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors
• An Electronic Model for $Co{O}_2$ layer based systems: Chiral RVB metal and Superconductivity
• Theory of Superconductivity in Strongly Correlated Electron Systems
• Superconductivity mediated by charge fluctuations in layered molecular crystals
• Hall Effect and Resistivity in High-Tc Superconductors: The Conserving Approximation
• Quasi-two-dimensional organic superconductors: a review
• Phase diagram for a class of spin-half Heisenberg models interpolating between the square-lattice, the triangular-lattice and the linear chain limits
• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations
• Orbital Fluctuation Theory in Iron Pnictides: Effects of As-Fe-As Bond Angle, Isotope Substitution, and $Z^2$-Orbital Pocket on the Superconductivity
• Instabilities of interacting electrons on the triangular lattice
• 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
• Superconductivity and a Mott Transition in a Hubbard Model on an Anisotropic Triangular Lattice
• The Paired Electron Crystal: order from frustration in the quarter-filled band
• Superconductivity and spin correlation in organic conductors: a quantum Monte Carlo study
• d_{x^2-y^2}- vs. d_{xy}- like pairings in organic superconductors κ-(BEDT-TTF)_2 X
• High-resolution ac-calorimetry studies of the quasi-2D organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Pairing and superconductivity driven by strong quasiparticle renormalization in two-dimensional organic charge transfer salts
• Absence of superconductivity in the half-filled band Hubbard model on the anisotropic triangular lattice
• Pseudogap Phenomena and Superconducting Fluctuations in Hubbard Model for High-Tc Cuprates
• Paramagnetic limiting of the upper critical field of the layered organic superconductor $\kappa -(BEDT-TTF{)}_{2}Cu(SCN{)}_2$
• The Dependence of the Superconducting Transition Temperature of Organic Molecular Crystals on Intrinsically Non-Magnetic Disorder: a Signature of either Unconventional Superconductivity or Novel Local Magnetic Moment Formation
• Possible high $T_c$ superconductivity mediated by antiferromagnetic spin fluctuations in systems with Fermi surface pockets
• Gossamer Superconductivity near Antiferromagnetic Mott Insulator in Layered Organic Conductors
• The Heisenberg antiferromagnet on an anisotropic triangular lattice: linear spin-wave theory
• Pairing Symmetry Competition in Organic Superconductors
• d- and p-wave superconductivity mediated by spin fluctuations in two- and three-dimensional single-band repulsive Hubbard model
• Antiferromagnetism and Superconductivity in layered organic conductors: Variational cluster approach
• Angle Dependent Magnetoresistance of the Layered Organic Superconductor κ-(ET)2Cu(NCS)2: Simulation and Experiment
• Magnetic and Electronic Phase Diagram and Superconductivity in the Organic Superconductors k-(BEDT-TTF)2X
• Unconventional superconductivity on the triangular lattice Hubbard model
• Real space imaging of the metal - insulator phase separation in the band width controlled organic Mott system $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br
• Dynamical properties of a strongly correlated model for quarter-filled layered organic molecular crystals
• Odd-frequency Superconductivity on a Quasi-one-dimensional Triangular Lattice in the Hubbard Model
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Near-degeneracy of extended $s+d_{x^2-y^2}$ and $d_{xy}$ order parameters in quasi-two-dimensional organic superconductors
• Spin-triplet superconductivity in repulsive Hubbard models with disconnected Fermi surfaces: a case study on triangular and honeycomb lattices
• Origin of Superconductivity in 2D-Organic Compounds and High-T_c Cuprates
• Small-q phonon-mediated superconductivity in organic κ-BEDT-TTF compounds
• Phase Competition and Superconductivity in $\kappa$-(BEDT-TTF)${}_2$X: Importance of Intermolecular Coulomb Interactions
• Magnetoresistance in High-Tc Superconductors: The Role of Vertex Corrections
• Origin of the Superconductivity in β'-(BEDT-TTF)_2ICl_2 under High Pressure and β-(BEDT-TTF)_2X at Ambient Pressure
• Absence of long-range superconducting correlations in the frustrated 1/2-filled band Hubbard model
• Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets
• TU${}^2$FRG -- a scalable approach for truncated unity functional renormalization group in generic fermionic models
• Polar Charge Fluctuation and Superconductivity in Organic Conductor
• Mechanism of superconductivity and electron-hole doping asymmetry in $\kappa$-type molecular conductors
• Coulomb enhancement of superconducting pair-pair correlations in a $\frac{3}{4}$-filled model for $\kappa$-(BEDT-TTF)${}_2$X
• On the Relationship Between the Critical Temperature and the London Penetration Depth in Layered Organic Superconductors
• From Kondo Effect to Fermi Liquid
• Test for Pairing Symmetry Based on Spin Fluctuations in Organic Superconductors $\kappa$-(BEDT-TTF)${}_2$X
• Phase transitions in partial summation methods: Results from the 3D Hubbard model
• Superconductivity in Organic Compounds with Pseudo-Triangular Lattice
• Phase Diagram of ${\beta }^{\prime }$-(BEDT-TTF)${}_2$ICl${}_2$ under High Pressure Based on the First-Principles Electronic Structure
• Theory of the Hall Coefficient and the Resistivity on the Layered Organic Superconductors κ-(BEDT-TTF)
• Electronic Structure Calculation and Superconductivity in $\lambda$-(BETS)${}_2$GaCl${}_4$
• Mixed pairing symmetry in κ-(BEDT-TTF)_2 X organic superconductors from ultrasonic velocity measurements
• Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice
• Suppression of superconductivity by non-magnetic disorder in organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Magnetotunneling spectroscopy as a probe for pairing symmetry determination in quasi-2D anisotropic superconductors
• Symmetry change of $d$-wave superconductivity in $\kappa$-type organic superconductors
• Superconductivity in the vicinity of charge ordered state in organic conductor beta-(meso-DMBEDT-TTF)_2PF_6
• Zero-bias conductance peak splitting due to multiband effect in tunneling spectroscopy
• Organic superconductors: the need to go beyond effective 1/2-filled band models
• Symmetrized mean-field description of magnetic instabilities in k-(BEDT-TTF)_2Cu[N(CN)]_2 Y salts
• $d$- and $p$-wave quantum liquid crystal orders in cuprate superconductors, $\kappa$-(BEDT-TTF)${}_2$X, and coupled chain Hubbard models: functional-renormalization-group analysis
• Transverse and in-plane modification of superconductivity and electronic structure in the quasi-two dimensional organic conductor $\kappa$--(BEDT-TTF)${}_2$Cu(SCN)${}_2$ by uniaxial stress
• Predominant Magnetic States in Hubbard Model on Anisotropic Triangular Lattices
• Basal-Plane Magnetic Anisotropies of High-kappa d-Wave Superconductors in a Mixed State: A Quasiclassical Approach
• Prediction of pseudogap formation due to $d$-wave bond-order in organic superconductor $\kappa$-(BEDT-TTF)${}_2$X
• Theory of triangular lattice quasi-one-dimensional charge-transfer solids
• Charge imbalance in $\lambda$-(BETS)${}_2$GaCl${}_4$ and their interplay with superconductivity
• Microwave Conductivity Distinguishes Between Different d-wave States: Umklapp Scattering in Unconventional Superconductors
• Variational Monte Carlo studies of a t-J model on an anisotropic triangular lattice
• Spin Fluctuation-Induced Superconductivity in κ-BEDT-TTF Compounds
• Theory of the beta-type Organic Superconductivity under Uniaxial Compression
• Absence of superconductivity in the Hubbard dimer model for kappa-(BEDT-TTF)_2X
• Calculation of Penetration Depth and $T_c$ in $\kappa$-$($ET${)}_2$Cu(NCS)${}_2$ under Pressure