Effect of superconducting fluctuations on ultrasound in unconventional superconductor

Details Effect of superconducting fluctuations on ultrasound in unconventional superconductor Effect of superconducting fluctuations on ultrasound in unconventional superconductor

2004-12-21

arxiv.org/abs/cond-mat/0412553v1

Phys. Rev. B 72, 024508 (2005)

Physics

Condensed Matter

Superconductivity

13 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevB.72.024508

We study the renormalization of sound attenuation and sound velocity by fluctuation Cooper pairs in layered superconductors. We consider the influence of s- and d-wave symmetry of the fluctuating order parameter, on both longitudinal and transverse phonon modes. We show that both unconventional order parameter symmetry and transverse sound polarization suppress the AL and MT terms, while the DOS contribution is the least affected. The combination of these effects can change the sign of the overall fluctuation corrections above Tc. We also compare the results obtained using the Ginzburg-Landau formalism with a microscopic derivation of the fluctuation corrections to the sound velocity in both s- and d-wave superconductors. These calculations are motivated by ongoing ultrasound measurements in organic superconductors.

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