Thermodynamics of the superconducting phase in compressed GeH 4 (H 2)2

R. Szczȩśniak, D. Szczȩśniak, A. P. Durajski

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Recent studies on the hydrogen-rich metals are mainly stimulated by the fact that these superconductors are supposed to exhibit the high value of the critical temperature (TC). The thermodynamic properties of GeH4(H2)2 hydride under the pressure at 250 GPa have been studied in the present paper. The calculations have been conducted in the framework of the Eliashberg approach for the wide range of the Coulomb pseudopotential values: μ ε 0.1,0.3. It has been found that the critical temperature is high in the entire range of the Coulomb pseudopotential: TC 128.5,69.8K. The values of the thermodynamic dimensionless ratios, namely ≡2Δ(0)/ kBTC, RC≡ΔC(TC)/ CN(TC), and RHTC CN(TC)/HC2(0), differ from the predictions of the Bardeen-Cooper-Schrieffer theory. In particular, 4.30,4.08, RC 1.91,1.58, and RH 0.151,0.154. Finally, the ratio of the electron effective mass (meâl†) to the electron band mass (me) reaches the maximum at the critical temperature, where meâl†/me=2.45.

Original languageEnglish
Pages (from-to)6-11
Number of pages6
JournalSolid State Communications
Volume184
DOIs
Publication statusPublished - 2014
Externally publishedYes

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critical temperature
Thermodynamics
Hydrogen
thermodynamics
pseudopotentials
BCS theory
Electrons
Hydrides
Temperature
Superconducting materials
hydrides
electrons
Thermodynamic properties
thermodynamic properties
Metals
hydrogen
predictions
metals

Keywords

  • A. Hydrogen-rich compound
  • A. Superconductivity
  • D. High-pressure effects
  • D. Thermodynamic properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Chemistry

Cite this

Thermodynamics of the superconducting phase in compressed GeH 4 (H 2)2 . / Szczȩśniak, R.; Szczȩśniak, D.; Durajski, A. P.

In: Solid State Communications, Vol. 184, 2014, p. 6-11.

Research output: Contribution to journalArticle

Szczȩśniak, R. ; Szczȩśniak, D. ; Durajski, A. P. / Thermodynamics of the superconducting phase in compressed GeH 4 (H 2)2 In: Solid State Communications. 2014 ; Vol. 184. pp. 6-11.
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