Journal
PHYSICAL REVIEW B
Volume 73, Issue 6, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.73.060502
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Low-temperature scanning tunneling microscopy and/or scanning tunneling spectroscopy measurements of heavily overdoped Bi2-xPbxSr2CuOy have revealed nanoscale electronic inhomogeneity composed of spatial regions showing superconducting and pseudogaplike gap structures. This proves that the inhomogeneity is a general feature of Bi-based cuprates, regardless of the number of CuO2 planes. The magnitude of inhomogeneity, defined as relative standard deviation of the local gap value, is close to that of slightly overdoped Bi2Sr2CaCu2Oy, suggesting that the electronic inhomogeneity arises from excess oxygen atoms in the (BiO)(2) layers.
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