4 papers · 1 filter
Is the Superconductiong State for the Cuprates Reached Through a Percolation Transition?
E. V. L. de Mello, E. S. Caixeiro, J. L. González
Several recent experiments have revealed that the charge density in a given compound (mostly underdoped) is intrinsic inhomogeneous with large nanoscale spatial variations. The…
A Novel Theory for High Temperature Superconductors considering Inhomogeneous Charge Distributions
E. V. L. de Mello, E. S. Caixeiro, J. L. Gonzaléz
We present a percolation theory for the high- oxides pseudogap and dependence on the hole level. The doping dependent inhomogeneous charge structure is modeled by a dist…
The Hubbard model applied to the phase diagram and pressure effects in YBa_2Cu_3O_{7-δ} superconductors
E. S. Caixeiro, E. V. L. de Mello
We apply a method based on a BCS-type approach to the extended Hubbard model to deal with the YBa_2Cu_3O_{7-δ} superconductor family under pressure. The parameters of the tight-bin…
The extended Hubbard model applied to phase diagram and the pressure effects in \Bi superconductors
E. V. L. de Mello
We use the two dimensional extended Hubbard Hamiltonian with the position of the attractive potential as a variable parameter with a BCS type approach to study the interplay betwee…