Physics – Condensed Matter – Superconductivity
Scientific paper
2003-12-11
Phys. Rev. B 69, 224503 (2004)
Physics
Condensed Matter
Superconductivity
13 pages, 6 figures. Accepted for PRB. Added discussion on incoherent interlayer tunneling and other small modifications sugge
Scientific paper
10.1103/PhysRevB.69.224503
We consider the temperature dependence of the sound attenuation and sound velocity in layered impure metals due to superconducting fluctuations of the order parameter above the critical temperature. We obtain the dependence on material properties of these fluctuation corrections in the hydrodynamic limit, where the electron mean free path is much smaller than the wavelength of sound and where the electron collision rate is much larger than the sound frequency. For longitudinal sound propagating perpendicular to the layers, the open Fermi surface condition leads to a suppression of the divergent contributions to leading order, in contrast with the case of paraconductivity. The leading temperature dependent corrections, given by the Aslamazov-Larkin, Maki-Thompson and density of states terms, remain finite as T->Tc. Nevertheless, the sensitivity of new ultrasonic experiments on layered organic conductors should make these fluctuations effects measurable.
Bourbonnais Claude
Mar'enko M. S.
Tremblay A. M. -S.
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