Thermodynamic Critical Magnetic Field for Chlorine Halide Superconductor at High Pressure

D. Szczęśniaka, R. Szczęśniakb aInstitute of Physics, Jan Długosz University in Częstochowa, al. Armii Krajowej 13/15, 42-200 Częstochowa, Poland bInstitute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland

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At present, hydrides are considered as a one of the most interesting high-temperature superconductors with the classical electron-phonon pairing mechanism. In the present paper, we have analyzed the dependence of the thermodynamic critical magnetic field (Hc) on the temperature for the chlorine halide superconductor. The calculations have been made in the framework of the Eliashberg formalism for the following pressure values: p1 = 320 GPa and p2 = 360 GPa. We have shown that Hc increases strongly with the increase of the pressure: [Hc(0)]p2/[Hc(0)]p1 = 1.43. Furthermore, the dimensionless ratio: RH ≡ TcCN(Tc)/Hc2(0), where Tc and CN denote the critical temperature and the specific heat of the normal state, differs from the value predicted by the Bardeen-Cooper-Schrieffer theory. In particular: [RH]p1 = 0.166 and [RH]p2 = 0.158.

DOI: 10.12693/APhysPolA.126.344 PACS numbers: 74.20.Fg, 74.25.Bt, 74.62.Fj