Characterization of Novel High-Pressure Close-Packed Superconducting Phase of Boron
D. Szczęśniaka and 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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We report study on the thermodynamic properties of the novel high-pressure superconducting phase of boron with hexagonal P63/mcm structure. Our analysis is conducted at the pressure of p=400 GPa, which is motivated by the highest value of the superconducting transition temperature (TC) observed previously under such conditions for the P63/mcm boron. Our investigations of the thermodynamic properties are performed within the Eliashberg formalism, due to the strong-coupling character of the considered material. In particular, we calculate the thermodynamic properties of the superconducting state which allows us to determine the values of the characteristic dimensionless parameters; The zero-temperature energy gap to the critical temperature, the ratio of the specific heats, as well as the ratio connected with the zero-temperature thermodynamic critical field.

DOI: 10.12693/APhysPolA.127.254
PACS numbers: 74.25.Bt, 74.62.Fj, 74.20.Fg