Superconductivity and its mechanism in an ab initio model for electron-doped LaFeAsO.

Superconductivity in LaFeAs1−xPxO: effect of chemical pressures and bond covalency

We report the realization of superconductivity by an isovalent doping with phosphorus in LaFeAsO. X-ray diffraction shows that, with the partial substitution of P for As, the Fe2As2 layers are squeezed while the La2O2 layers are stretched along the c-axis. Electrical resistance and magnetization measurements show emergence of bulk superconductivity at ∼10 K for the optimally-doped LaFeAs1−xPxO ...

Superconductivity in doped cubic silicon: an ab initio study

عدم تقارن الکترون-حفره در کوپراتهای دمای بالا از دید نظری

  Asymmetric features of various physical quantities in the normal and superconducting states between hole- and electron-doped cuprate high-temperature superconductors have been an issue of debate for a long time. Their exploration is very important for the understanding not only of the mechanism of high-Tc superconductivity but also of the nature of doped-Mott insulators. Presented in this rev...

Dynamical screening at the metal–semiconductor interface and excitonic superconductivity

We examine the possibility of excitonic superconductivity at a metal–semiconductor interface. An ab initio RPA calculation of the screened Coulomb electron–electron interaction is performed for the silicon–jellium multilayer model. The superconducting kernel for this multilayered system is found to be positive in the whole frequency range considered. We show that the inclusion of local field ef...

Role of the dopant in the superconductivity of diamond.

We present an ab initio study of the recently discovered superconductivity of boron doped diamond within the framework of a phonon-mediated pairing mechanism. The role of the dopant, in substitutional position, is unconventional in that half of the coupling parameter lambda originates in strongly localized defect-related vibrational modes, yielding a very peaked Eliashberg alpha2F(omega) functi...