Characterization of the high-pressure superconductivity in the Pnma phase of Calcium

Details Characterization of the high-pressure superconductivity in the Pnma phase of Calcium Characterization of the high-pressure superconductivity in the Pnma phase of Calcium

2011-10-13

arxiv.org/abs/1110.2870v2

Physics

Condensed Matter

Superconductivity

Scientific paper

All important thermodynamic parameters of the superconducting state that induces in Calcium under the pressure at 161 GPa were calculated. It has been shown that the value of the Coulomb pseudopotential is high and equal to 0.24. The critical temperature equal to 25 K should be determined directly from the Eliashberg equations or with an use of the modified Allen-Dynes formula. On the basis of the Eliashberg equations solutions the basic thermodynamic ratios were calculated. In particular: R1=4.01, R2=2.17 and R3=0.158. The results above mean that the thermodynamic properties of the superconducting state significantly diverge from the BCS predictions. Finally, it has been also proven that the electron effective mass is large and takes its maximum, which is equal to 2.32 of the bare electron mass, at critical temperature.

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