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Showing 1 to 5 of 5 for “"strong coupling theory"”.
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Running Coupling Constant and Transition From Low to High Energies in Quantum Chromodynamics
<p>The remarkable feature of QCD is that the coupling constant (the strength of the interaction) depends on the energy of the interacting particles. At high energies, the coupling constant vanishes and QCD becomes asymptotically free. However, at lower energy, the running coupling constant …
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Electron tunneling into superconducting mercury films below one degree Kelvin
… the use of a computer program based on the strong-coupling theory. The effective phonon spectrum and the complex energy gap function for mercury are thereby derived. Values for the electron self energy function, the electron renormalization function, Coulomb pseudopotentia1, and the …
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Transmission of far infrared radiation through thin films of superconducting amorphous bismuth and gallium
… 50 to 200 ~. Numerical calculations based on the strong-coupling theory of superconductivity and on tunneling data produced theoretical values of Ts /Tn for comparison with the data, showing moderately good agreement. For each sample the energy gap 2wg was determined. For bismuth and gallium, Tc …
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The superconducting penetration depth in thin films of lead
… end and to compare our experimental results with theory, we calculated the coherence length and the superconducting conductivity at finite temperatures by using the strong-coupling theory of superconducting lead. Our experimental results for the superconducting conductivity at zero temperature and …
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A study of superconducting lead-indium alloys subjected to hydrostatic pressure using the electron tunneling technique
… spectrum F(ω) weighted by the electron-phonon coupling function α<sup>2</sup>(ω), the dimensionless electron-phonon interaction strength λ, and the average electron-phonon coupling function .<α<sup>2</sup>> have been determined for the superconducting alloys Pb<sub>95</sub>In<sub>5</sub> and …