Collective modes and ultrasonic attenuation in a pseudogapped superconductor

Article

关键词: QUANTUM PHASE-TRANSITION;   

DOI  :  10.1103/PhysRevB.96.064523

来源: SCIE

【 摘 要 】

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

【 授权许可】

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