Abstract
Scanning tunneling microscopy and scanning tunneling spectroscopy (STS) measurements were performed on Bi2SrCaCuO6 whose superconducting transition temperature Tc is about 80K. The superconducting gap obtained by the STS measurements was found to be about 40meV. This value is close to that of optimally doped Bi2Sr2CaCu2O8 which has similar Tc. The observed spatial inhomogeneity of the gap value was much smaller than that of Bi2Sr2CuO6.
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