Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1592597 | Solid State Communications | 2013 | 5 Pages |
The critical temperature (TC) and the energy gap (2Δ(T)2Δ(T)) for the superconductor SiH4SiH4(H2H2)2 at 250 GPa have been calculated. The wide range of the Coulomb pseudopotential's values has been considered: μ⋆∈〈0.1,0.3〉μ⋆∈〈0.1,0.3〉. It has been stated that TC decreases together with the increase of μ⋆μ⋆ from 129.83 K to 81.40 K. The low-temperature energy gap (T∼0T∼0 K) decreases together with the increase of the Coulomb pseudopotential from 50.96 meV to 30.12 meV. The high values of 2Δ(0)2Δ(0) mean that the dimensionless ratio RΔ≡2Δ(0)/kBTCRΔ≡2Δ(0)/kBTC significantly exceeds the value predicted by the classical BCS theory. In the considered case: RΔ∈〈4.55,4.29〉RΔ∈〈4.55,4.29〉. Due to the unusual dependence of the critical temperature and the energy gap on μ⋆μ⋆, the analytical expressions for TC(μ⋆)TC(μ⋆) and Δ(μ⋆)Δ(μ⋆) have been given.
► Thermodynamic parameters of the superconducting state that induces in SiH4SiH4(H2H2)2 under the pressure at 250 GPa. ► The high critical temperature. ► The non BCS value of the ratio 2Δ/kBTC2Δ/kBTC. ► The large electron effective mass.