Study of the superconducting phase in silicene under biaxial tensile strain

A. P. Durajski, D. Szcze¸s̈niak, R. Szcze¸s̈niak

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The electron-doped silicene under the influence of the biaxial tensile strain is predicted to be the phonon-mediated superconductor. By using the Eliashberg formalism, we investigate the thermodynamic properties of the superconducting silicene in the case when the tension is 5% and the electron doping equals 3.5×1014cm-2. Under such conditions, silicene monolayer is expected to exhibit the highest superconducting transition temperature (TC). In particular, based on the electron-phonon spectral function and assuming a wide range of the Coulomb pseudopotential values (μ∗ ∈ 〈0.1,0.3〉) it is stated that the superconducting transition temperature decreases from 18.7 K to 11.6 K. Similar behavior is observed in the case of the zeroth temperature superconducting energy gap at the Fermi level: 2Δ(0)∈ 〈6.68,3.88〉 meV. Other thermodynamic parameters differ from the predictions of the Bardeen-Cooper-Schrieffer theory. In particular, the ratio of the energy gap to the critical temperature changes in the range from 4.14 to 3.87. The ratio of the specific heat jump to the specific heat in the normal state takes the values from 2.19 to 2.05, and the ratio of the critical temperature and specific heat in the normal state to the thermodynamic critical field increases from 0.143 to 0.155. It is also determined that the maximum value of the electron effective mass equals 2.11 of the electron band mass.

Original languageEnglish
Pages (from-to)17-21
Number of pages5
JournalSolid State Communications
Volume200
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Tensile strain
Electrons
Specific heat
specific heat
electrons
Superconducting transition temperature
critical temperature
Energy gap
transition temperature
Thermodynamics
thermodynamics
BCS theory
Fermi level
Temperature
Superconducting materials
pseudopotentials
Monolayers
Thermodynamic properties
thermodynamic properties
Doping (additives)

Keywords

  • A. Silicene
  • A. Superconductivity
  • A. Two-dimensional systems
  • D. Thermodynamic properties

ASJC Scopus subject areas

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

Cite this

Study of the superconducting phase in silicene under biaxial tensile strain. / Durajski, A. P.; Szcze¸s̈niak, D.; Szcze¸s̈niak, R.

In: Solid State Communications, Vol. 200, 2014, p. 17-21.

Research output: Contribution to journalArticle

Durajski, A. P. ; Szcze¸s̈niak, D. ; Szcze¸s̈niak, R. / Study of the superconducting phase in silicene under biaxial tensile strain. In: Solid State Communications. 2014 ; Vol. 200. pp. 17-21.
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AB - The electron-doped silicene under the influence of the biaxial tensile strain is predicted to be the phonon-mediated superconductor. By using the Eliashberg formalism, we investigate the thermodynamic properties of the superconducting silicene in the case when the tension is 5% and the electron doping equals 3.5×1014cm-2. Under such conditions, silicene monolayer is expected to exhibit the highest superconducting transition temperature (TC). In particular, based on the electron-phonon spectral function and assuming a wide range of the Coulomb pseudopotential values (μ∗ ∈ 〈0.1,0.3〉) it is stated that the superconducting transition temperature decreases from 18.7 K to 11.6 K. Similar behavior is observed in the case of the zeroth temperature superconducting energy gap at the Fermi level: 2Δ(0)∈ 〈6.68,3.88〉 meV. Other thermodynamic parameters differ from the predictions of the Bardeen-Cooper-Schrieffer theory. In particular, the ratio of the energy gap to the critical temperature changes in the range from 4.14 to 3.87. The ratio of the specific heat jump to the specific heat in the normal state takes the values from 2.19 to 2.05, and the ratio of the critical temperature and specific heat in the normal state to the thermodynamic critical field increases from 0.143 to 0.155. It is also determined that the maximum value of the electron effective mass equals 2.11 of the electron band mass.

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