Scanning tunneling microscopy investigations of the local structure of Tl sub 2 Ba sub 2 CaCu sub 2 O sub 8 single crystals

Journal Article · Mon Nov 13 04:00:00 EST 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102345· OSTI ID:5373893

Wu, X L; Lieber, C M ^[1]; Ginley, D S; Baughman, R J ^[2]

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1. Department of Chemistry, Columbia University, New York, New York 10027 (US)
2. Sandia National Laboratories, Albuquerque, New Mexico 87185 (US)

The in-plane structure of single-crystal samples of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} has been imaged at room temperature using a scanning tunneling microscope. Atomic-resolution surface images exhibit areas in which the structure has tetragonal symmetry (peak spacing 2.5{plus minus}0.2 A) and regions in which the structure is distorted from tetragonal symmetry. The lattice spacing indicates that the observed structure corresponds to the in-plane thallium and oxygen positions. The observation of both sites also suggests that the Tl-O band makes a significant contribution to the density of states near the Fermi level. In addition, a weak one-dimensional superlattice (period 10{plus minus}0.5 A) which shows short-range order has been observed.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5373893
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 55:20; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
ENERGY LEVELS
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
FERMI LEVEL
IMAGES
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
SUPERLATTICES
SURFACES
TETRAGONAL LATTICES
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS