C-axis Josephson plasma resonance observed in Tl2Ba2CaCu2O8 superconducting thin films by use of terahertz time-domain spectroscopy
Optics Letters, Vol. 26, Issue 16, pp. 1292-1294 (2001)
http://dx.doi.org/10.1364/OL.26.001292
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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±0.6μm to 94±9μm . 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 ~0.95Tc . The JPR vanishes above Tc as expected.
© 2001 Optical Society of America
[Optical Society of America ]
OCIS Codes
(300.6530) Spectroscopy : Spectroscopy, ultrafast
(310.6860) Thin films : Thin films, optical properties
Citation
V. K. Thorsmølle, R. D. Averitt, M. P. Maley, L. N. Bulaevskii, C. Helm, and A. J. Taylor, "C-axis Josephson plasma resonance observed in Tl2Ba2CaCu2O8 superconducting thin films by use of terahertz time-domain spectroscopy," Opt. Lett. 26, 1292-1294 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-16-1292
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