The effect of strain and pressure on the electron-phonon coupling and superconductivity in MgB2—Benchmark of theoretical methodologies and outlook for nanostructure design

Different theoretical methodologies are employed to investigate the effect of hydrostatic pressure and anisotropic stress and strain on the superconducting transition temperature ( T c) of MgB 2. This is done both by studying Kohn anomalies in the phonon dispersions alone and by explicit calculation...

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Bibliographic Details
Published in:Journal of applied physics 2022-02, Vol.131 (6)
Main Authors: Johansson, Erik, Tasnádi, Ferenc, Ektarawong, Annop, Rosen, Johanna, Alling, Björn
Format: Article
Language:English
Subjects:
Anomalies
Applied physics
Coupling
Epitaxial growth
Hydrostatic pressure
Lattice strain
Magnesium compounds
Phonons
Pressure effects
Superconductivity
Transition temperature
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Summary:Different theoretical methodologies are employed to investigate the effect of hydrostatic pressure and anisotropic stress and strain on the superconducting transition temperature ( T c) of MgB 2. This is done both by studying Kohn anomalies in the phonon dispersions alone and by explicit calculation of the electron–phonon coupling. It is found that increasing pressure suppresses T c in all cases, whereas isotropic and anisotropic strain enhances the superconductivity. In contrast to trialed epitaxial growth that is limited in the amount of achievable lattice strain, we propose a different path by co-deposition with ternary diborides that thermodynamically avoid mixing with MgB 2. This is suggested to promote columnar growth that can introduce strain in all directions.
ISSN:0021-8979
1089-7550
1089-7550
DOI:10.1063/5.0078765