Nonequilibrium superconductivity in Y1-xPrxBa2Cu3O7 thin films

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 ${\sigma }_{re}(\omega$) + i${\sigma }_{im}(\omega$) 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 ${\sigma }_{re}$ is faster than ${\sigma }_{im}$, and the recovery of ${\sigma }_{im}$ decreases with increasing frequency. This suggests another carrier relaxation pathway, in addition to superconducting pair recovery, following optical excitation.

To appear in Physica B

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