Abstract
The atomic-scale surface electronic states on the multi-layered apical-fluorine cuprate superconductor Ba2Ca5Cu6O12 (O1−x, Fx)2(TC≃70K) are investigated by using low temperature scanning tunneling microscopy/spectroscopy (STM/STS). The spatial gap distributions show the patch scale of ∼0.5nm, which is quite shorter than the superconducting coherence length ∼2–3nm of other cuprate superconducters of a few nm. The high-bias (∼1V) conductance map contains some characteristic spots with contrasts reverse to those at low bias, which are considered to be due to the charge unbalance of apical atoms such as O2− and F−.
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