Scanning Tunneling Microscopy/Spectroscopy of Heavily Overdoped Bi2Sr2CuOy Single Crystals

2006 
We have carried out scanning tunneling microscopy/spectroscopy (STM/STS) of heavily overdoped Bi2Sr2CuOy single crystals with Tc<2 K. STS spectra showed a pseudogap structure with dull coherence peaks. Furthermore, we found that the magnitude of pseudogap is spatially non‐uniform in a nm scale and varies from 10 to 30 meV. This supports a scenario that the electronic inhomogeneity is a consequence of randomly distributed Coulomb potential in the CuO2 layers induced by disorder of excess oxygen in the BiO layers.
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