Temperature dependence of electronic Raman-scattering spectra in superconducting Bi2Sr2CaCu2O8+δ single crystals
A. Yamanaka, H. Takato, F. Minami, K. Inoue, S. Takekawa
DOI 10.1103/PhysRevB.46.516 · Physical Review B
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Abstract
The electronic Raman scattering of both tetragonal A1g and B1g symmetries has been measured in Bi2Sr2CaCu2O8+δ single crystals as a function of the temperature. We observe that a redistribution of the electronic continuum spectrum below Tc exhibits two aspects of the temperature dependence: One of them is associated with its energy scale, which has a significant temperature variation only just below Tc. This indicates an abrupt opening of the superconducting gap. The other is associated with the variation of the spectral weight, which shows a more gradual temperature dependence compared with the former. This indicates that a superconducting condensation of thermally excited quasiparticles occurs gradually with decreasing temperature. We also find that the A1g and B1g spectra exhibit a similar temperature dependence below Tc.
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. | 86 | Pressure not reported | zero_resistance |
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