Electric potential of the electron sound wave: Sharp disappearance in the superconducting state

Yu. A. Avramenko; E. V. Bezuglyi; N. G. Burma; V. D. Fil

doi:10.1103/PhysRevB.84.214504

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Electric potential of the electron sound wave: Sharp disappearance in the superconducting state

Yu. A. Avramenko, E. V. Bezuglyi, N. G. Burma, V. D. Fil

DOI 10.1103/PhysRevB.84.214504 · Physical Review B

T1

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Abstract

We study the ac electric potential induced by the electron sound wave (a perturbation of the electron distribution function propagating with the Fermi velocity) in single crystals of high-purity gallium. The potential and the elastic components of the electron sound demonstrate qualitatively different dependencies on the electron relaxation rate: while the phase of the potential increases with temperature, the phase of elastic displacement decreases. This effect is explained within the multiband model, in which the potential is attributed to the ballistic quasiwave, while the elastic component is associated with the zero-sound wave. We observed a mysterious property of the superconducting state: all manifestations of the potential accompanying the lattice deformations, including usual sound wave, disappear below Tc in almost jumplike manner.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown