c-axis response of YBa2Cu4O8: A pseudogap and possibility of Josephson coupling of CuO2 planes
D. N. Basov, T. Timusk, B. Dabrowski, J. D. Jorgensen
DOI 10.1103/PhysRevB.50.3511 · Physical Review B
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Abstract
We report on the temperature dependence of the far-infrared conductivity of YBa2Cu4O8 single crystals for E∥c. With decreasing temperature, the conductivity shows a transition from a Drude-like behavior to a pseudogap at 180 cm−1 which grows deeper below 180 K without any abrupt changes at the superconducting transition at Tc=80 K. In the superconducting state the formation of the superfluid condensate can be seen. We show that in a variety of high-Tc superconductors the value of the London penetration depth for E∥c correlates with the conductivity along the c direction. With respect to this correlation we discuss the possibility of Josephson coupling between the CuO2 layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| YBa2Cu3O6.70 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.84Sr0.16CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb2Sr2RCu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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