Abstract
Scanning tunneling microscopy (STM) has been used to characterize the surface structure of cleaved single crystals of Bi 2.2 Sr 1.8 CuO y and Bi 2.2 Sr 1.8 Cu 0.9 Fe 0.1 O y . Images of Bi 2.2 Sr 1.8 CuO y exhibit a one-dimensional superstructure with period of 25.1±0.3 A. The atomic structure in these images is ordered and shows no evidence of local distortions due to Sr 2+ substitution and/or extra oxygen in the BiO layer
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