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Crystal Field Theory
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Electron-phonon coupling in La3In under pressure.

Surinder Singh1, Udomsilp Pinsook1

  • 1Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 17, 2023
PubMed
Summary
This summary is machine-generated.

This study calculates superconducting properties of La3In, finding an electron-phonon coupling constant of 1.43 and a transition temperature of 8.7 K. These findings align with experimental data and explore pressure effects.

Keywords:
Eliashberg–Migdal formalismconventional superconductivityelectron-phonon couplingpositive hydrostatic pressurespin–orbit coupling

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Superconducting materials exhibit zero electrical resistance below a critical temperature.
  • Lanthanum-indium (La3In) is a material with potential superconducting properties.
  • Understanding electron-phonon interactions is crucial for predicting and enhancing superconductivity.

Purpose of the Study:

  • To calculate conventional superconducting parameters for La3In.
  • To investigate the influence of hydrostatic pressure on these properties.
  • To elucidate the role of electron-phonon coupling and spin-orbit coupling.

Main Methods:

  • Eliashberg spectral function calculations.
  • Phonon density of states (DOS) and dispersion relations analysis.
  • Fermi surface calculations and spin-orbit coupling effects.

Main Results:

  • Ambient pressure electron-phonon coupling constant: 1.43; superconducting transition temperature: 8.7 K (experimental: 9.5 K).
  • Calculations confirmed dynamical stability of La3In under positive hydrostatic pressure.
  • Acoustic phonon modes significantly contribute to electron-phonon interactions; spin-orbit coupling effects were studied.

Conclusions:

  • The calculated superconducting parameters for La3In are in good agreement with experimental values.
  • Hydrostatic pressure does not compromise the dynamical stability of La3In.
  • Electron-phonon coupling, particularly mediated by acoustic modes, is key to La3In's superconductivity.