LAUSR

Abstract In the framework of strong-coupling formalism, we have calculated the thermodynamic parameters of superconducting state in the YB6 compound. The values of critical temperature (TC) are 9.5 K and 7.9 K for the Coulomb pseudopotential μ⋆ = 0.1 and 0.2, respectively. In the paper, we have determined the low temperature values of order parameter (Δ(0)), specific heat jump at the critical temperature (ΔC(TC)), and thermodynamic critical field (HC(0)). The dimensionless thermodynamic ratios: R Δ = 2 Δ 0 / k B T C , R C = Δ C T C / C N T C , and R H = T C C N T C / H C 2 0 are equal to: R Δ μ ⋆ ∈ { 4.48 , 4.35 } , R C μ ⋆ ∈ { 2.62 , 2.55 } , and R H μ ⋆ ∈ { 0.146 , 0.157 } . Due to the significant strong-coupling and retardation effects (kBTC∕ωln ∼ 0.1) those values highly deviate from the predictions of BCS theory.