Thermodynamics of the superconducting state in Calcium at 200 GPa

Details Thermodynamics of the superconducting state in Calcium at 200 GPa Thermodynamics of the superconducting state in Calcium at 200 GPa

2011-08-07

arxiv.org/abs/1108.1574v2

J Supercond Nov Magn (2012) 25: 399-404

Physics

Condensed Matter

Superconductivity

7 pages, 6 figures

Scientific paper

10.1007/s10948-011-1326-y

The thermodynamic parameters of the superconducting state in Calcium under the pressure at 200 GPa were calculated. The Coulomb pseudopotential values ($\mu^{\star}$) from 0.1 to 0.3 were taken into consideration. It has been shown, that the specific heat's jump at the critical temperature and the thermodynamic critical field near zero Kelvin strongly decrease with $\mu^{\star}$. The dimensionless ratios $r_{1}\equiv \Delta C(T_{C})/C^{N}(T_{C})$ and $r_{2}\equiv T_{C}C^{N}(T_{C})/H^{2}_{C}(0)$ significantly differ from the predictions based on the BCS model. In particular, $r_{1}$ decreases from 2.64 to 1.97 with the Coulomb pseudopotential; whereas $r_{2}$ increases from 0.140 to 0.157. The numerical results have been supplemented by the analytical approach.

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