Oxygen doping Bi2Sr2CaCu2O8+δ superconductors: Variations in the BiO-layer electronic states determined by scanning tunneling microscopy

Zhe Zhang; Charles M. Lieber

doi:10.1103/PhysRevB.46.5845

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Oxygen doping Bi2Sr2CaCu2O8+δ superconductors: Variations in the BiO-layer electronic states determined by scanning tunneling microscopy

Zhe Zhang, Charles M. Lieber

DOI 10.1103/PhysRevB.46.5845 · Physical Review B

T1

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Abstract

Scanning tunneling spectroscopy (STS) and microscopy (STM) have been used to elucidate the low-energy electronic states and structure of the BiO layer in high-pressure oxygen-annealed Bi2Sr2CaCu2O8+δ single crystals. Our STS measurements demonstrate that oxygen doping increases the BiO layer density of states (DOS) near the Fermi level. Atomic resolution images indicate, however, that the BiO layer may not become metallic. These results provide a picture of the electronic changes in the BiO layer due to oxygen doping and elucidate the relationship between variations in the BiO layer DOS and Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	84	Pressure unresolved	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	unknown