Photoemission studies of Zn, Co, and Gd substituted YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}
Zn and Co substitute for Cu in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} at the plane and chain sites, respectively. We report a high resolution angle-resolved photoemission study on Zn and Co substituted YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} single crystals to determine the effects on electronic structure. The valence states near E{sub F} along {Gamma}-S are virtually unaffected by the substitutions for samples that are superconducting. However, the spectral weight near E{sub F} disappears for a higher Co-doped, nonsuperconducting crystal. Results are compared with earlier studies on pure YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} with controlled oxygen stoichiometry. Measurement on Gd-123 crystals with reduced oxygen stoichiometries show gradual reduction of spectral weight for a band along {Gamma}-Y(X), in contrast to the results for the bands along {Gamma}-S. The differences are probably due to a different admix of Cu-O chain and plane characters in these bands. We also measured Gd 4f resonance spectra which exhibit complex structure, indicating the presence of Gd atoms in chemically inequivalent (probably bulk and near surface) sites.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10176595
- Report Number(s):
- ANL/MSD/CP-80258; CONF-930367-8; ON: DE93017403; CNN: DMR 91-20000(CG); DMR 8601349
- Resource Relation:
- Conference: Conference on spectroscopies in novel superconductors,Santa Fe, NM (United States),17-19 Mar 1993; Other Information: PBD: Jun 1993
- Country of Publication:
- United States
- Language:
- English
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