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C-axis Josephson plasma resonance observed in Tl2Ba2CaCu2O8 superconducting thin films by use of terahertz time-domain spectroscopy

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Abstract

We have unambiguously observed the c-axis Josephson plasma resonance (JPR) in high-critical-temperature Tc cuprate Tl2Ba2CaCu2O8 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-Tc material in transmission. With increasing temperature, the JPR shifts from 705 GHz at 10 K to 170 GHz at 98 K, corresponding to an increase in c-axis penetration depth from 22.4±0.6 μm to 94±9 μm. 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 c-axis phase coherence to 0.95 Tc. The JPR vanishes above Tc as expected.

© 2001 Optical Society of America

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