The characterization of high-pressure superconducting state in Si2H6 compound: the strong-coupling description

Abstract

The thermodynamic parameters of the superconducting state, that induces in $\mathrm{S}{\mathrm{i}}_2{\mathrm{H}}_6$ under the pressure at 275 GPa, have been calculated. In the framework of the Eliashberg formalism, it has been shown that the critical temperature can attain extremely high values: $T_C({\mu }^{\star })\in <173.36,99.99>$ K, where the Coulomb pseudopotential $({\mu }^{\star })$ belongs to the range from 0.1 to 0.3. The ratio of the energy gap to the critical temperature ($R_{\Delta }$) significantly exceeds the value predicted by the BCS theory: $R_{\Delta }({\mu }^{\star })\in <4.40,4.04>$. Additionally, it has been stated that in the whole range of the superconducting state's existence, the electron effective mass ($m_e^{\star }$) is large; $[m_e^{\star }{]}_{T=T_C}^{\max }=2.397m_e$, where the symbol $m_e$ denotes the electron band mass.

7 pages, 5 figures

References in corpus (5)

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• Characterization of the high-pressure superconductivity in the Pnma phase of calcium
• On the critical temperature and the energy gap in dense SiH4(H2)2 at 250 GPa
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Cited by in corpus (3)

• Non-BCS thermodynamic properties of H2S superconductor
• Description of the superconducting state in the high-pressure fcc phase of platinum-hydride
• The high-pressure superconductivity in SiH4: the strong-coupling approach