Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-17
Phys. Rev. B 82, 024513 (2010)
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures
Scientific paper
10.1103/PhysRevB.82.024513
The transient response of Ba(Fe(1-x)Co(x))2As2, x=0.08 was studied by pump-probe optical reflectivity. After ultrafast photoexcitation, hot electrons were found to relax with two different characteristic times, indicating the presence of two distinct decay channels: a faster one, of less than 1 ps in the considered pump fluence range, and a slower one, corresponding to lattice thermalization and lasting ~6 ps. Our analysis indicates that the fast relaxation should be attributed to preferential scattering of the electrons with only a subset of the lattice vibration modes, with a second moment of the Eliashberg function lambda(omega^2)~64 meV^2. The simultaneous excitation of a strong fully symmetric A(1g) optical phonon corroborates this conclusion and makes it possible to deduce the value of lambda~0.12. This small value for the electron-phonon coupling confirms that a phonon mediated process cannot be the only mechanism leading to the formation of superconducting pairs in this family of pnictides.
Boschetto D.
Bouquet Frederic
Colson Dorothee
Forget Anne
Mansart B.
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