Oxygen Behavior in the Superconductor (Bi,Pb)2Sr2Ca2Cu3Oy Phase Studied by X-Ray Photoelectron Spectroscopy

Samples annealed in lower and higher oxygen partial pressure than P(O2) = 10(-2) atm show T(c) shift to the lower temperatures compared with the sample annealed in P(O2) = 10(-2) atm, which shows the highest T(c), 107 K. X-ray Photoelectron Spectroscopy (XPS) measurement was carried out to study the behavior of oxygen and the change of chemical environments of each ion in the high T(c) phase, dependent on the annealing atmosphere changes becoming the origin of these phenomena. The tendency toward increasing binding energies of Bi 4f7/2 and Cu 2p3/2 with increasing oxygen partial pressures during the heat treatments indicates that the mobile oxygens are located in the (Bi, Pb)-O and the Cu-O layers. We know that the valence of Cu moves to +3 with increasing oxygen content in the structure, and this increase of Cu valence indicates the enhancement of hole creation.
Publisher
JAPAN J APPLIED PHYSICS
Issue Date
1992-03
Language
ENG
Keywords

HIGH-TC SUPERCONDUCTIVITY; CU-O SUPERCONDUCTOR; BISMUTH; SYSTEM; TRANSITION; MECHANISM

Citation

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES REVIEW PAPERS, v.31, no.3, pp.775 - 779

ISSN
0021-4922
URI
http://hdl.handle.net/10203/7826
Appears in Collection
MS-Journal Papers(저널논문)
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