Fine-structure in the low-energy excitation spectrum of a high-Tc superconductor by polarization-dependent photoemission
R. Manzke, R. Müller, C. Janowitz, M. Schneider, A. Krapf, H. Dwelk
DOI 10.1103/PhysRevB.63.100504 · Physical Review B
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Abstract
Angle-resolved photoemission spectroscopy is performed on single crystals of the single-layer high-Tc superconductor Bi2Sr2−xLaxCuO6+δ at optimal doping (x=0.4) in order to study in great detail the Zhang-Rice (ZR) singlet band at the Fermi level. Besides the high crystal quality the advantages of a single-layer material are the absence of bilayer effects and the distinct reduction of thermal broadening. Due to the high energy and angle resolution and, most important, due to the controlled variation of the polarization vector of the synchrotron radiation, the emission from the ZR singlet band reveals a distinct fine structure. It consists of two maxima, the first showing only weak and the second at EF extremely strong polarization dependence. However, our observation has enormous consequences for line-shape analyses and the determination of pseudogaps by photoemission.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure unresolved | onset |
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure unresolved | unknown |
| Bi2Sr2CaCu2O8+δ 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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