Gossamer Superconductivity near Antiferromagnetic Mott Insulator in   Layered Organic Conductors
  Layered organic superconductors are on the verge of the Mott insulator. We use Gutzwiller variational method to study a Hubbard model including a spin exchange coupling term. The ground state is found to be a Gossamer superconductor at small on-site Coulomb repulsion U and an antiferromagnetic Mott insulator at large U, separated by a first order phase transition. Our theory is qualitatively consistent with major experiments reported in organic superconductors. 
J. Y. Gan, Yan Chen, Z. B. Su, and F. C. Zhang