Femtosecond quasiparticle relaxation dynamics and probe polarization anisotropy in YBa2Cu4O8
D. Dvorsek, V. V. Kabanov, J. Demsar, S. M. Kazakov J. Karpinski, D. Mihailovic
Abstract
Femtosecond pump probe experiments are reported on quasiparticle relaxation and recombination in YBa2Cu4O8 as a function of temperature and polarization. The data show a 2-component relaxation similar to YBa2Cu3O7-δ, one component being assocated with the superconducting transition, and the other with the pseudogap below T* The relaxation time taup associated with the pseudogap is found to be T-independent, while the relaxation time taug of the component obseved only below Tc exhibits a clear divergence near Tc. A strong polarisation anisotropy of the picosecond transient is observed below Tc which is attributed to the anisotropy of the probe transition matrix elements.
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