Electronic and structural effects of oxygen doping in Bi sub 2 Sr sub 2 CaCu sub 2 O sub x superconductors characterized by tunneling microscopy

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.8729· OSTI ID:5592163

Wu, X L; Wang, Y L; Zhang, Z; Lieber, C M ^[1]

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1. Department of Chemistry, Columbia University, New York, New York 10027 (US)

Scanning tunneling microscopy has been used to characterize the electronic and structural effects of oxygen doping in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}} materials. Bias-voltage-dependent images of oxygen-deficient nonsuperconducting crystals show that reversible oxygen loss leads to nonperiodic variations in the electronic states near the Fermi level ({plus minus}300 mV). Variations in the electronic states near the Fermi level are not observed, however, in images of superconducting samples. In addition, high-resolution images of the BiO layer of oxygen-deficient samples do not exhibit vacancies or strongly perturbed sites, but rather appear similar to images of the BiO layer of superconducting crystals. These data indicate that suppression of {ital T}{sub {ital c}} in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}} may not be due to oxygen loss from the BiO layer.

• OSTI ID: 5592163
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
ELEMENTS
HIGH-TC SUPERCONDUCTORS
IMPURITIES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
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STRONTIUM OXIDES
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