Free-Carrier Relaxation Dynamics in the Normal State of Sintered YBa2Cu3O7-y

摘要

The conductivity of Yttrium Barium Copper Oxide (YB a2 Cu3O7-y)in the normal state has been obtained from a measurement of the reflectivity over a wide frequency range. The product of the Drude model parameters wpt 1 indicates that the plasma oscillations are overdamped. The free-carrier electrodynamics are well described by a frequency-dependent scattering rate which rises linearly in frequency from the dc value and saturates at a value consistent with scattering at the unitarity limit with a concomitant frequency-dependent mass enhancement. (MJM)