Electrodynamics ofYBa2Cu3

Budhani Rc

¹

,

L. Lesyna

²

,

Donald DiMarzio

³

et al.

Abstract

Transmission measurements on YBa&Cu307 films in the spectral range 25 to 100 cm ' have been performed using synchrotron radiation. In the normal state, the classical Drude conductivity function successfully explains the rise in transmission with frequency. The spectra below T, show a strong supercurrent screening of the infrared field. A temperature-dependent penetration depth is calculated from the transmission spectra using the local-limit-response kernel and a quasiparticle conductivity rising as ( T/T, ) . Depending on the film quality, the zero-temperature penetration depth varies from 234 to 340 nm.

Low temperature penetration depth and the effect of quasi-particle scattering measured by millimeter wave transmission in YBa Cu O thin films

“…We report in this paper penetration depth results obtained in three selected thin films (which we describe specifically in Section 4). The penetration depth is deduced from far infra red (FIR) transmission of an electromagnetic wave through the sample, one technique among very few others which yields not only the variation of λ(T ) with temperature, but its zero temperature valueλ 0 [20,33,34]. As already stated, this is a key parameter for a reliable comparison with theoretical models.…”