Physics – Condensed Matter – Superconductivity
Scientific paper
2001-11-02
Physics
Condensed Matter
Superconductivity
Submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevB.66.012519
We measured the Josephson plasma resonance (JPR) in optimally doped Tl$_2$Ba$_2$CaCu$_2$O$_{8+\delta}$ thin films using terahertz time-domain spectroscopy in transmission. The temperature and magnetic field dependence of the JPR frequency shows that the c-axis correlations of pancake vortices remain intact at the transition from the vortex solid to the liquid phase. In this respect Tl$_2$Ba$_2$CaCu$_2$O$_{8+\delta}$ films, withanisotropy parameter $\gamma\approx 150$, are similar to the less anisotropic YBa$_2$Cu$_3$O$_{7-\delta}$ $(\gamma\approx 8)$ rather than to the most anisotropic Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ single crystals $\gamma\geq 500$).
Averitt Richard D.
Bulaevskii Lev N.
Hundley M. F.
Koshelev Alexei E.
Maley Martin P.
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