Antiferromagnetism and superconductivity in layered organic conductors: Variational cluster approach.

ابررسانای d- موجی، پادفرومغناطیس و مایع اسپینی در ابررساناهای آلی شبه دوبعدی

  The self-energy-functional approach is a powerful many-body tool to investigate different broken symmetry phases of strongly correlated electron systems. We use the variational cluster perturbation theory (also called the variational cluster approximation) to investigate the interplay between the antiferromagnetism and d-wave superconductivity of κ-(ET)2 X conductors. These compounds are desc...

Mott transition, antiferromagnetism, and d-wave superconductivity in two-dimensional organic conductors.

We study the Mott transition, antiferromagnetism, and superconductivity in layered organic conductors using the cellular dynamical mean-field theory for the frustrated Hubbard model. A d-wave superconducting phase appears between an antiferromagnetic insulator and a metal for t'/t=0.3-0.7 or between a nonmagnetic Mott insulator (spin liquid) and a metal for t'/t>or=0.8, in agreement with experi...

Title Gossamer superconductivity near antiferromagnetic mott insulator in layered organic conductors

Variational Monte-Carlo studies of Gossamer Superconductivity

We use a partially Gutzwiller projected BCS d-wave wavefunction with an antiferromagentic weighting factor to study the ground state phase diagram of a half filled Hubbard-Heisenberg model in a square lattice with nearest neighbor hopping t and a diagonal hopping t′. The calculations are carried out by using variational Monte Carlo method which treats the Gutzwiller projection explicitly. At la...

Superconductivity and Antiferromagnetism in Quasi-one-dimensional Organic Conductors

We review the current understanding of superconductivity in the quasi-onedimensional organic conductors of the Bechgaard and Fabre salt families. We discuss the interplay between superconductivity, antiferromagnetism, and charge-density-wave fluctuations. The connection to recent experimental observations supporting unconventional pairing and the possibility of a tripletspin order parameter for...