Study of thermodynamic properties of SiH4(H2)2 superconductor under high pressure

The thermodynamic parameters of the superconducting state for SiH4(H-2)(2) compound under the pressure at 250 GPa have been investigated. The calculations have been made in the framework of the Eliashberg formalism. In particular, the free energy difference (Delta F) between the superconducting (S) and normal (N) state, the specific heat (C), as well as, the thermodynamic critical field (H-C) have been determined. It has been shown that the considered thermodynamic functions are beyond the BCS predictions; the ratio (C-S(T-C) - C-N(T-C))/C-N(T-C) decreases from 2.43 to 2.34 with increase of the Coulomb pseudopotential (mu(star) is an element of 0.1, 0.3), and the parameter TCCN(T-C)/H-c(2)(0) increases from 0.140 to 0.145. The numerical results have been supplemented with the interpolation approach. (C) 2012 Elsevier B. V. All rights reserved.