Abstract
We have unambiguously observed the -axis Josephson plasma resonance (JPR) in high-critical-temperature cuprate superconducting thin films, employing terahertz time-domain spectroscopy in transmission as a function of temperature in zero magnetic field. These are believed to be the first measurements of the JPR temperature dependence of a high- material in transmission. With increasing temperature, the JPR shifts from 705 GHz at 10 K to at 98 K, corresponding to an increase in -axis penetration depth from to . The linewidth of the JPR peak increases with temperature, which indicates an increase in the quasi-particle scattering rate. We have probed the onset of the -axis phase coherence to . The JPR vanishes above as expected.
© 2001 Optical Society of America
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