SPECIFIC HEAT AND THERMODYNAMIC CRITICAL FIELD FOR CALCIUM UNDER THE PRESSURE AT 120 GPa.

In the paper, the thermodynamic parameters of the superconducting state for Calcium under the pressure at 120 GPa have been determined. The numerical analysis has been made in the framework of the Eliashberg approach. In particular, the free energy difference between the superconducting and normal state has been calculated. On the basis of the obtained results, the specific heat for the superconducting (C^S) and normal (C^N) state, as well as the thermodynamic critical field (H_C) have been determined. It has been shown that the characteristic values of the considered thermodynamic functions do not obey the BCS universal laws: ΔC(T_C)/C^N(T_C) = 2.48 and $T_{C}C^{N}(T_{C})/H^{2}_{C}(0) = 0.154$. [ABSTRACT FROM AUTHOR]