Long-wavelength collective excitations of charge carriers in high-Tc superconductors
N. Nücker, U. Eckern, J. Fink, P. Müller
DOI 10.1103/PhysRevB.44.7155 · Physical Review B
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Abstract
The long-wavelength dispersion of the charge-carrier plasmon in Bi2Sr2CaCu2O8 for wave vectors parallel to the CuO2 planes has been investigated by transmission-electron-energy-loss spectroscopy. For the [100] and the [110] directions the size of the quadratic plasmon dispersion differs by a factor of about 2. This strong in-plane anisotropy can be explained by a calculation in the framework of the random-phase approximation using a simple tight-binding ansatz for the CuO band having a quadratic Fermi surface. However, a different Fermi surface at a lower-energy scale cannot be excluded.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87.1 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85.7 | Pressure not reported | zero_resistance |
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