The thermodynamic parameters of the superconducting state, that induces in ${ \rm Si_{ 2}H_{ 6}}$ 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, where the Coulomb pseudopotential $(\mu^{ \star})$ belongs to the range from 0.1 to 0.3. The ratio of the energy gap to the critical temperature ($R_{ \Delta}$) significantly exceeds the value predicted by the BCS theory: $R_{ \Delta}(\mu^{ \star})\in<4.40, 4.04>$. Additionally, it has been stated that in the whole range of the superconducting state's existence, the electron effective mass ($m^{ \star}_{ e}$) is large; $[m^{ \star}_{ e}]^{ \rm max}_{ T=T_{ C}}=2.397m_{ e}$, where the symbol $m_{ e}$ denotes the electron band mass.
Categories: cond-mat.supr-con