c-axis penetration depth and interlayer conductivity in the thallium-based cuprate superconductors
Diana Dulić, D. van der Marel, A. A. Tsvetkov, W. N. Hardy, Z. F. Ren, J. H. Wang, B. A. Willemsen
DOI 10.1103/PhysRevB.60.R15051 · Physical Review B
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Abstract
The c-axis Josephson plasmons in optimally doped single-layer and bilayer high-Tc cuprates Tl2Ba2CuO6 and Tl2Ba2CaCu2O8 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 Josephson resonances 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 quasiparticle contribution to the c-axis conductivity is absent or very weak.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | unknown |
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