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

The thermodynamic parameters of the superconducting state in Si2H6 compound 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 reach extremely high values: T-C(mu*) is an element of < 173.36,99.99 > K, where the Coulomb pseudopotential (mu*) belongs to the range from 0.1 to 0.3. The ratios R-Delta 2 Delta(0)/k(B)T(C) c and R-C Delta C(T-C)/C-N(T-C) significantly exceed the values predicted by the BCS theory: R-Delta (mu*) is an element of < 4.40,4.04 > and R-C(mu*) is an element of < 2.45,2.28 >. In contrast, R-H TCCN(T-C)/H-C(2)(0) is smaller than in the BCS model: R-H (mu*) is an element of < 0.137,0.149 >. Additionally, it has been stated that in the whole range of the existence of the superconducting state, the electron effective mass (m(e)*) is large; [m(e)*](T = TC)(max) =2.397m(e), where the symbol m(e) denotes the electron band mass. (C) 2013 Elsevier Ltd. All rights reserved.