Josephson plasma frequencies in overdoped Bi2Sr2CaCu2O8+δ
H. Shibata, A. Matsuda
DOI 10.1103/PhysRevB.59.R11672 · Physical Review B
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Abstract
Far-infrared sphere resonance in Bi2Sr2CaCu2O8+δ samples with various oxygen concentrations is measured down to 5 cm−1. Although no peaks are observed in this frequency range for the optimumly doped sample, the Josephson plasma peak is observed at 5 cm−1 for a 1−atm−O2-annealed sample. The peak shifts to higher frequencies as the doping increases, and is observed at 11 cm−1 for a 150−atm−O2-annealed sample. The c-axis penetration depth λc obtained from the peak frequencies is determined to be 77 to 35 μm. These large λc values are larger than the value estimated from the Josephson-coupled layer model, while the doping dependence is qualitatively explained by the model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 71 | Pressure not reported | unknown |
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