C-axis Penetration Depth and Inter-layer Conductivity in the Thallium Based Cuprate Superconductors

Details C-axis Penetration Depth and Inter-layer Conductivity in the Thallium Based Cuprate Superconductors C-axis Penetration Depth and Inter-layer Conductivity in the Thallium Based Cuprate Superconductors

1999-08-13

arxiv.org/abs/cond-mat/9908206v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.60.R15051

The c-axis Josephson plasmon in optimally doped single-layer and bi-layer high Tc cuprates Tl2201 and Tl2212 have been investigated using infrared spectroscopy. We observed the plasma frequencies for these two compounds at 27.8 and 25.6 cm-1 respectively, which we interpret as a Josephson resonance across the TlO blocking layers. No maximum in the temperature dependence of the c-axis conductivity was observed below Tc, indicating that even in the superconducting state a coherent quasi-particle contribution to the c-axis conductivity is absent or very weak, in contrast to the behaviour of the ab-plane conductivity.

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