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Electronic state and superconductivity of YBa2Cu3-xO7-y (M=Al,Zn and Sn) systemsA series of YBa2Cu(3-x)MxO(7-y) (M=Al,Zn and Sn) single phase samples were prepared, and the measurements of the crystal structure, oxygen content, electric resistivity, thermoelectric power, Mossbauer spectrum, XPS and superconductivity were performed. The experimental results of X ray powder diffraction, Mossbauer spectrum and oxygen content show that the Zn(2+) and the Al(3+) occupy the Cu(2) site in Cu-O planes and the Cu(1) site in Cu-O chains respectively, but the Sn(4+) occupies both the Cu(1) sites. As regards the properties in superconducting state, both the Zn(2+) and the Al(3+) depress T(sub c) strongly, but the Sn(4+) does not. As for the electronic transport properties in normal state, the system doped by Al(3+) displays a rapid increase of resistivity and some electron localization-like effects, and the thermoelectric power enhances obviously; the series contained Zn(2+) almost shows no changes of electric resistivity but the sign of the thermoelectric power is reversed. Other results are given and briefly discussed.
Document ID
19900018526
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Zhao, Y. (Zhejiang Univ. (China). Hofei., United States)
Zhang, Q. R. (Zhejiang Univ. (China).)
Zhang, H. (China Scientific and Technical Univ.)
Date Acquired
September 6, 2013
Publication Date
April 1, 1990
Publication Information
Publication: NASA, Goddard Space Flight Center, AMSAHTS 1990: Advances in Materials Science and Applications of High Temperature Superconductors
Subject Category
Electronics And Electrical Engineering
Accession Number
90N27842
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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