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Optics Letters

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  • Vol. 26, Iss. 16 — Aug. 15, 2001
  • pp: 1292–1294

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

V. K. Thorsmølle, R. D. Averitt, M. P. Maley, L. N. Bulaevskii, C. Helm, and A. J. Taylor  »View Author Affiliations


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 (<i>T</i><sub>c</sub>) cuprate (Tl<sub>2</sub>Ba<sub>2</sub>CaCu<sub>2</sub>O<sub>8</sub>) 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-<i>T</i><sub>c</sub> 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 ~0.95T<sub>c</sub> . The JPR vanishes above T<sub>c</sub> as expected.

© 2001 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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References

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