Abstract
Local variation of electronic structure on the cleaved surface of BiSrCaCuO has been investigated by cryogenic STM/STS under magnetic fields up to 6T. Most of the cleaved surface showed a semiconducting nature, possibly due to the loss of oxygen from the surface in an inert atmosphere. However, it was found that the surface degraded layers can be removed by the STM scanning with appropriate bias conditions. On the fresh surfaces as etched, a clear superconducting gap structure was reproducibly observed. At 6 T, the vortex lattice was not imaged by STM/STS, suggesting that the STM tip repels the vortex lines.
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