Collective modes and ultrasonic attenuation in a pseudogapped superconductor
A. V. Shtyk, M. V. Feigel'man
DOI 10.1103/PhysRevB.96.064523 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| InOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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