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Variation in Tc and Carrier Concentration Caused by Change of Oxygen Content in Tl-Based Superconductors

Published online by Cambridge University Press:  28 February 2011

Y. Shimakawa ,
Y. Kubo ,
T. Manako  and
H. Igarashi
Y. Shimakawa
Affiliation:
Fundamental Research Laboratories, NEC Corporation 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
Y. Kubo
Affiliation:
Fundamental Research Laboratories, NEC Corporation 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
T. Manako
Affiliation:
Fundamental Research Laboratories, NEC Corporation 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
H. Igarashi
Affiliation:
Fundamental Research Laboratories, NEC Corporation 4–1–1 Miyazaki, Miyamae-ku, Kawasaki 213, Japan
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Abstract

Tc variations observed in some Tl-based superconductors were studied. Clear correlations were found between Tc, carrier concentration, and c-axis length. In particular, for Tl2Ba2CuO6, a decrease in oxygen content of about 0.1 per formula unit, which corresponded to a decrease in hole concentration of about 0.2, increased Tc up to about 80K from a metallic non-superconductor, and elongated the c axis by about 0.4%. In addition, as Tc values increased systematic changes in metal-sheet separations were observed. Tc variations caused by a change in oxygen content were also observed in Tl2Ba2CaCu2O8 and Tl2Ba2Ca2Cu3O10. It was demonstrated that superconductivity appears in a certain appropriate range of carrier concentration similar to those observed in other high-Tc superconductors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1061
Copyright
Copyright © Materials Research Society 1990

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