Nonequilibrium superconductivity in Y1-xPrxBa2Cu3O7 thin films
arXiv:cond-mat/0204066 · doi:10.1016/S0921-4526(01)01166-8
Abstract
We have measured the picosecond conductivity dynamics in Y1-xPrxBa2Cu3O7 thin films from 0.3-2.0 terahertz. Our experimental technique measures the complex conductivity $Ï_{re}(Ï$) + i$Ï_{im}(Ï$) permitting the simultaneous observation of superconducting pair and quasiparticle dynamics. We emphasize aspects of the conductivity dynamics which extend our previous results. In particular, the recovery of $Ï_{re}$ is faster than $Ï_{im}$, and the recovery of $Ï_{im}$ decreases with increasing frequency. This suggests another carrier relaxation pathway, in addition to superconducting pair recovery, following optical excitation.
To appear in Physica B