Bernard Giovannini

Gorkov equations for a pseudogapped high-temperature superconductor

A phenomenological theory of superconductivity based on the two-body Cooperon propagator is presented. This theory takes the form of a modified Gorkov equation for the Greens function and allows one to model the effect of local superconducting correlations and long-range phase fluctuations on the spectral properties of high-temperature superconductors, both above and below

Hall effect in underdoped GdBa 2 Cu 3 O 7 − δ thin films: Evidence for a crossover line in the pseudogap regime

{T}_{c}.

Density of States in High-Tc Superconductor Vortices

A model is proposed for the Cooperon propagator, which provides a simple physical picture of the pseudogap phenomenon, as well as insights into the doping dependence of the spectral properties. Numerical calculations of the density of states and spectral functions based on this model are also presented, and compared with the experimental tunneling (STM) and photoemission (ARPES) data. It is found, in particular, that the sharpness of the peaks in the density of states is related to the strength and the range of the superconducting correlations and that the apparent pseudogap in STM and ARPES can be different, although the underlying model is the same.

Cooperon propagator description of high-temperature superconductivity

We report on measurements of the resistivity and Hall coefficient in underdoped

Density of States in High- T c Superconductor Vortices

{\mathrm{GdBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}

Towards a microscopic theory of inhomogeneous superconductors

epitaxial thin films grown by off-axis magnetron sputtering. The films have been lithographically patterned allowing precise measurements of the temperature dependencies of the inverse Hall constant

Extraordinary Hall-effect in ferromagnetic (rare-earth) Al 2

{R}_{H}^{\ensuremath{-}1}

Energy modelling beyond economics and technology

and of the Hall angle

Perturbation Theory for Magnetic Impurities in Metals

{\ensuremath{\theta}}_{H}.

Perspectives de la demande d'énergie en Suisse, 1985-2025

We find that