Optical evidence for strong anisotropy in the normal and superconducting states in Bi2Sr2CaCu2O8+z
S. Tajima, G. D. Gu, S. Miyamoto, A. Odagawa, N. Koshizuka
DOI 10.1103/PhysRevB.48.16164 · Physical Review B
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Abstract
The optical reflectivity spectra for the bc surface of a large Bi2Sr2CaCu2O8+z crystal were investigated over a wide energy range (30–30 000 cm−1) at room temperature and 6 K. In the spectrum for E∥c, only the phonon peaks were observed without any electronic contribution down to 30 cm−1, whereas for E∥b a Drude-like spectrum was observed. Even below Tc the spectrum for E∥c does not show any remarkable change except for a small change in the phonon spectrum. This indicates an extremely small plasma frequency for E∥c, less than 30 cm−1, and thus quite a large mass anisotropy mc*/mb*>104. Such a small plasma frequency supports the conduction model along the c axis, that the supercurrent flows by tunneling through insulating (semiconductor) layers such as the Bi-O layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+z Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+z Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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