Metal hydrogen sulfide critical temperature at the pressure 225 gpa
  \'Eliashberg theory, being generalized to the electron-phonon (EP) systems with not constant density of electronic states, as well as to the frequency behavior of the renormalization of both the electron mass and the chemical potential, is used to study hydrogen sulphide phase under pressure. The phonon contribution to the anomalous electron Green's function (GF) is considered. The pairing is considered within the overall width of the electron band, and not only in a narrow layer at the Fermi surface. The frequency and the temperature dependences of the electron mass renormalization ReZ , the density of electronic states , renormalized by the EP interaction , the spectral function of the electron-phonon interaction, obtained by calculation are used to calculate the electronic abnormal GF. The \'Eliashberg generalized equations with the variable density of electronic states are resolved. The dependence of both the real and the imaginary part of the order parameter on the frequency in the phase is obtained. The value in the hydrogen sulfide phase at the pressure P = 225 GPa has been defined. 
Nikolay Kudryashov, Alexander Kutukov, Evgeny Mazur
cond-mat.supr-con