Study of the High-Pressure Superconducting State in H₃Se at 300 GPa

Abstract

In the present paper, the selected thermodynamic properties of the superconducting state in H3Se compound are theoretically characterized. In the considered system, the superconducting state is induced under the pressure of 300 GPa. The numerical calculations are conducted in the framework of the Eliashberg formalism, due to the relatively high value of the electron-phonon coupling constant, λ = 1.05. In a result, the numerical values of the superconducting order parameter and the wave function renormalization factor, as a function of temperature, are obtained. It is found that the critical temperature value is ∼ 120 K; for the Coulomb pseudopotential equal to 0.1. Moreover, the difference between free energy for the normal and superconducting state, the critical magnetic field, as well as the specific heat for the superconducting and normal state on the temperature are determined. In a conclusion, it is suggested that the strong-coupling and retardation effects play pivotal role in the analyzed superconducting phase, similarly to what can be found in the breakthrough hydrogen sulfide material.