Observation of the Josephson plasma reflectivity edge in the infrared region in Bi-based superconducting cuprates
T. Motohashi, J. Shimoyama, K. Kitazawa, K. Kishio, K. M. Kojima, S. Uchida, S. Tajima
DOI 10.1103/PhysRevB.61.R9269 · Physical Review B
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Abstract
The far-infrared c-axis optical reflectivity spectra of a heavily Pb-doped Bi2212, Bi1.6Pb0.6Sr1.8CaCu2Oy, single crystal (Tc=65 K) were measured in the superconducting state. The crystal was found to be carrier overdoped as the optical phonons are weakly screened by the electronic excitations in the far-infrared region. Below Tc, a sharp reflectivity edge was observed, corresponding to the appearance of the Josephson plasma in the superconducting state. The plasma edge frequency reached 40 cm−1 at 8 K, which is comparable with that observed for other cuprates with much less anisotropy. The c-axis penetration depth λc=12.6μm was estimated from the unscreened plasma frequency ωpsc=126.2cm−1. This λc value is one order of magnitude smaller than that of the optimally doped pure Bi2212, reflecting a drastic enhancement of the interlayer coupling in Pb-doped Bi2212.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.6Pb0.6Sr1.8CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | midpoint |
| Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure not reported | unknown |
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