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Regular version of the site

Article

Collective modes and ultrasonic attenuation in a pseudogapped superconductor

Physical Review B: Condensed Matter and Materials Physics. 2017. Vol. 96. P. 064523-1-064523-8.
Shtyk A., Feigelman M.

We develop a theory of collective modes in a model of strongly disordered s-wave superconductor with a localization-induced pseudogap ΔP, that is much larger than superconducting gap Δ. Then we applied the obtained results to the calculation of the ultrasound decay rate α(ω) at low-frequencies ω≪kBT/ℏ. We show that at low temperatures T≪Tc the magnitude of the decay rate α(ω) is controlled by the ratio of T/Δ, while single-particle gap ΔP does enter the result for α(ω). Thus, we propose a new method to measure the collective gap Δ in a situation when strong pseudogap is present.