Article

The “phonon” mechanism of the effect of sound on the superconducting energy gap

V. G. Bar’yakhtarDonets Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR and Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRV. P. SeminozhenkoDonets Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR and Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR

Soviet Journal of Low Temperature Physicsjournal1976en

ABI

Abstract

Nonequilibrium effects of the phonon system of a superconductor caused by high-frequency sound irradiation on the energy gap Δ (ϵ ; T) are considered. It is shown that for low temperatures (T≪ Tc) and pumping frequencies (ω¯′&lt;2Δ) the effect of energy redistribution of electronic excitations (the Éliashberg mechanism) can be neglected. For sufficiently high supplied power (approximately 1 W/cm2) the nonequilibrium gap can exceed appreciably the zero-temperature equilibrium value Δ (ϵ,0); for Al the relative excess can consist of 25%.

Topics

Thermodynamic and Structural Properties of Metals and Alloys Quantum, superfluid, helium dynamics High-pressure geophysics and materials

Identifiers

DOI: 10.1063/10.0029409

Citations and references

Cited by 05 references

Metrics — AkademScholar