A fermi liquid electric structure and the nature of the carriers in high-T/sub c/ cuprates: A photoemission study

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5627106

Arko, A J; List, R S; Bartlett, R J; Cheong, S W; Fisk, Z; Thompson, J D; Olson, C G; Yang, A B; Liu, R; Gu, C; Veal, B W; Liu, J Z; Paulikas, A P; Vandervoort, K; Claus, H; Campuzano, J C; Schirber, J E; Shinn, N D

We have performed angle-integrated and angle-resolved photoemission measurements at 20 K on well-characterized single crystals of high-T/sub c/ cuprates (both 1:2:3-type and 2:2:1:2-type) cleaved in situ, and find a relatively large, resolution limited Fermi edge which shows large amplitude variations with photon energy, indicative of band structure final state effects. The lineshapes of the spectra of the 1:2:3 materials as a function of photon energy are well reproduced by band structure predictions, indicating a correct mix of 2p and 3d orbitals on the calculations, while the energy positions of the peaks agree with calculated bands only to within /approx/0.5 eV. This may yet prove to reflect the effects of Coulomb correlation. We nevertheless conclude that a Fermi liquid approach to conductivity is appropriate. Angle-resolved data, while still incomplete, suggest agreement with the Fermi surface predicted by the LDA calculations. A BCS-like energy gap is observed in the 2:2:1:2 materials, whose magnitude is twice the weak coupling BCS value (i.e., 2/Delta/ = 7 KT/sub c/). 49 refs., 11 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36; W-31109-ENG-38; W-7405-ENG-82
• OSTI ID: 5627106
• Report Number(s): LA-UR-89-2680; CONF-8907130-2; ON: DE89016774
• Resource Relation: Conference: 9. vacuum ultraviolet radiation conference, Honolulu, HI, USA, 17-21 Jul 1989; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ELECTRONIC STRUCTURE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
CRYSTAL LATTICES
ELECTRON-HOLE COUPLING
ENERGY GAP
PHOTOEMISSION
SUPERCONDUCTORS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
EMISSION
OXIDES
OXYGEN COMPOUNDS
SECONDARY EMISSION
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
656100* - Condensed Matter Physics- Superconductivity