Photoemission study of single crystal Bi2Sr2CaCu2O8
Abstract
Photoemission measurements with synchrotron radiation have been performed on single crystal Bi2Sr2CaCu2O8. Two energy bands with dispersion of 0.2-0.5 eV were observed in the vicinity of the Fermi level and one of them crosses the Fermi level midway between the center and boundary of the Brillouin zone, giving a clear evidence for existence of a Fermi surface. The Fermi-edge peak exhibits a pronounced enhancement at photon energy of the O 2s core threshold, meaning a dominant O 2p nature of the Fermi-edge states. These results indicate existence of the Fermi-liquid states with dominant O 2p nature in the high-Tc superconductor. The superconductivity could be driven by formation of Cooper-pairs of the O 2p holes in the Fermi-liquid states, probably through the spin or charge fluctuation.
- Publication:
-
Advances in Superconductivity
- Pub Date:
- 1989
- Bibcode:
- 1989adsc.proc..175T
- Keywords:
-
- Fermi Surfaces;
- High Temperature Superconductors;
- Mixed Oxides;
- Photoelectric Emission;
- Single Crystals;
- Brillouin Zones;
- Energy Bands;
- Fermi Liquids;
- Synchrotron Radiation;
- Vibrational Spectra;
- Solid-State Physics