Gossamer superconductivity near antiferromagnetic Mott insulator in layered organic conductors.
Layered organic superconductors are on the verge of the Mott insulator. We use the Gutzwiller variational method to study a two-dimensional Hubbard model including a spin exchange coupling term as a minimal model for the compounds. 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.
Gan
J Y
JY
Institute for Theoretical Physics, Chinese Academy of Sciences, Beijing, 100080, China.
Chen
Yan
Y
Su
Z B
ZB
Zhang
F C
FC