Collective modes and ultrasonic attenuation in a pseudogapped superconductor

A. V. Shtyk, M. V. Feigel'Man

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4 Citations (Scopus)


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 ωkBT/. We show that at low temperatures TTc 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.

Original languageEnglish
Article number064523
JournalPhysical Review B
Issue number6
Publication statusPublished - 24 Aug 2017
Externally publishedYes


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