Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
71 (1992), S. 2783-2788
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
X-ray and ultraviolet photoelectron spectroscopies were used to investigate the microscopic changes at the Ti/Bi2Sr2CaCu2O8 interface. Ti extracts oxygen out of the superconductor by disrupting vital bonds such as Cu—O and Bi—O. The adatom-induced oxygen withdrawal is explained on the basis of cationic bond lengths in the superconductor and standard bond strengths. The changes associated with Cu 2p spectra are attributed to an increase in covalency of Cu—O bonds, which is the consequence of a rearrangement of oxygen anions around Cu+2 ions. In the early stages of the interface formation, bismuth and titanium are in a complex bonding configuration, which is evident from their binding energies. The line shape analysis of Ti 2p spectra reveals that Ti is in multiple oxidation states at different stages of the evolving interface. This shows that the mobility of oxygen is an important factor which controls the overlayer growth.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.351055
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