New world of Gossamer superconductivity

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...

Title Gossamer superconductivity near antiferromagnetic mott

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 fir...

Title Gossamer superconductivity near antiferromagnetic mott insulator in layered organic conductors

New insight into superconductivity

NOVEMBER 2008 | VOLUME 11 | NUMBER 11 13 The physics of high-temperature cuprate superconductors in the overdoped regime, where superconductivity is suppressed, is something of a mystery. But first-principle calculations by researchers in the US and Switzerland appear to confirm a recent suggestion that ferromagnetism can destroy superconductivity at high doping levels [B. Barbiellini and T. Ja...