The characterization of high-pressure superconducting state in Si2H6 compound: the strong-coupling description

The thermodynamic parameters of the superconducting state, that induces in $\mathrm{S}{\mathrm{i}}_2{\mathrm{H}}_6$ under the pressure at 275 GPa, have been calculated. In the framework of the Eliashberg formalism, it has been shown that the critical temperature can attain extremely high values: $T_{C}(\mu^{\star})\in<173.36, 99.99>$K,wheretheCoulombpseudopotential$(\mu^{\star})$ belongs to the range from 0.1 to 0.3. The ratio of the energy gap to the critical temperature ($R_{\mathrm{\Delta }}$) significantly exceeds the value predicted by the BCS theory: $R_{\mathrm{\Delta }}({\mu }^{\star })\in <4.40,4.04>$. Additionally, it has been stated that in the whole range of the superconducting state’s existence, the electron effective mass ($m_e^{\star }$) is large; $[m^{\star}{e}]^{\rm max}{T=T_{C}}=2.397m_{e}$,wherethesymbol$m_{e}$ denotes the electron band mass.