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Scanning tunneling microscopy investigations of the local structure of Tl2Ba2CaCu2O8 single crystals

1989; American Institute of Physics; Volume: 55; Issue: 20 Linguagem: Inglês

10.1063/1.102345

1520-8842

Xian Wu, Charles M. Lieber, David S. Ginley, R.J. Baughman,

Rare-earth and actinide compounds

The in-plane structure of single-crystal samples of Tl2Ba2CaCu2O8 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±0.2 Å) 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±0.5 Å) which shows short-range order has been observed.