120 GPa压力下钙的比热和热力学临界场
Specifc Heat and Thermodynamic Critical Field for Calcium under the Pressure at 120 GPa
摘要：
测定了钙在120 GPa压力下超导态与正常态的自由能差。数值计算已在框架内的虚轴Eliashberg方法。在此基础上，得到了超导态C^{S}（T）和正常态C^{N}（T）的比热以及热力学临界场H_{C}（T）。结果表明，所考虑的热力学量的特征值不服从BCS普适定律。具体地，ΔC（T_{C}）/C^N（T_{C}）=2.48，并且T_{C} C^{N}（T_{C}）/ H_{C} ^{2}（0）=0.154。
英文摘要：
The free energy difference between the superconducting and normal state for Calcium under the pressure at 120 GPa has been determined. The numerical calculations have been made in the framework of the imaginary axis Eliashberg approach. On the basis of the obtained results the specific heat in the superconducting C^{S}(T) and normal C^{N}(T) state, as well as, the thermodynamic critical field H_{C}(T) have been obtained. It has been shown that the characteristic values of the considered thermodynamic quantities do not obey the BCS universal laws. In particular, ΔC(T_{C})/C^N(T_{C})=2.48 and T_{C}C^{N}(T_{C})/H_{C}^{2}(0)=0.154.
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