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Scanning tunneling spectroscopy on high Tc superconductors

Atomic site tunneling spectroscopy has been applied to bulk single crystals of BSCCO and laser-ablated thin films of YBCO. The tunneling spectrum on the cleaved surface of BSCCO showed both semiconducting and superconducting behaviors, depending on the tip-sample distance. This observation is consistent with the quasi two-dimensional layered model. In both systems, clear superconducting gap structures with quite low zero bias conductances were observed, suggesting the s-wave like symmetry of the order parameter.