C-axis Josephson Plasma Resonance Observed in Tl${}_2$Ba${}_2$CaCu${}_2$O${}_8$ Superconducting Thin Films using Terahertz Time-Domain Spectroscopy

Abstract

We have unambiguously observed the c-axis Josephson Plasma Resonance (JPR) in high-T${}_c$ cuprate Tl${}_2$Ba${}_2$CaCu${}_2$O${}_8$ superconducting thin films employing terahertz time-domain spectroscopy in transmission as a function of temperature in zero magnetic field. These are the first measurements of the JPR temperature dependence of a high-$T_c$ material in transmission. With increasing temperature, the JPR shifts from 705 GHz at 10 K to $\sim$170 GHz at 98 K corresponding to a c-axis penetration depth increasing from 20.1$\pm$0.6 $\mu$m to 84$\pm$9 $\mu$m. The linewidth of the JPR peak increases with temperature, indicative of an increase in the quasiparticle scattering rate. We have probed the onset of the c-axis phase coherence to $\sim$0.95T${}_c$. The JPR vanishes above T${}_c$ as expected.

7 pages, 4 postscript figures (can also be obtained from [email protected]), accepted in Optics Letters

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