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We report the result of the scanning tunneling microscopy and spectroscopy as well as atomic force microscopy measurements on the Nd2-xCexCuO4-y (NCCO) and PrBa2Cu3O7-x (PrBCO) single crystals. Using the scanning tunneling spectroscopy we were able to estimate the widths of the semiconducting gaps of the single crystals which were after a high temperature reduction in Ar. The characteristic features...
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